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pgf-spectra Examples

pgf-spectra is a PGF/TikZ package for drawing continuous, emission, and absorption spectra.

It can represent:

  • the continuous visible spectrum;
  • emission spectra of chemical elements;
  • absorption spectra;
  • spectra containing several elements;
  • neutral and ionized atoms;
  • wavelength axes and labels;
  • selected wavelength ranges;
  • relative line intensities;
  • ultraviolet, visible, and infrared ranges;
  • custom spectral lines;
  • redshifted or blueshifted spectra.

The package is included in the TikZJax runtime, but it is not automatically loaded into every diagram.

For the best performance, load it locally only where it is needed:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
>
\pgfspectra[
  element=H,
  width=10cm,
  height=1.5cm,
  axis,
  label
]
</script>

For other supported packages, return to the Examples overview.

Use:

data-tex-packages="pgf-spectra"

on every block that uses \pgfspectra or another command provided by the package:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
>
\pgfspectra[element=H]
</script>

Local package declarations are merged with globally configured packages.

They do not replace the global configuration.

Why local loading is recommended

pgf-spectra loads spectral data that ordinary TikZ diagrams do not need.

Loading it locally:

  • keeps unrelated diagrams lighter;
  • avoids processing spectral data in every TeX document;
  • reduces unnecessary work in each worker;
  • limits package interactions;
  • makes the requirements of each spectrum explicit.

Important syntax rule

The \pgfspectra command can be used directly:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
>
\pgfspectra[element=H]
</script>

A surrounding tikzpicture environment is not required for a standard spectrum:

\pgfspectra[
    element=H,
    axis,
    label
]

This direct form is the simplest and most reliable syntax in TikZJax.

Continuous visible spectrum

Calling \pgfspectra without an element produces a continuous visible spectrum.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="520" data-height="130"

\pgfspectra[ width=10cm, height=1.3cm ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="520"
  data-height="130"
>
\pgfspectra[
  width=10cm,
  height=1.3cm
]
</script>

No additional pgf-spectra library is required.

Basic hydrogen emission spectrum

An element symbol selects its spectral lines.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="560" data-height="180"

\pgfspectra[ element=H, width=10cm, height=1.5cm, axis, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="560"
  data-height="180"
>
\pgfspectra[
  element=H,
  width=10cm,
  height=1.5cm,
  axis,
  label
]
</script>

The default emission spectrum uses colored spectral lines on a dark background.

Helium emission spectrum

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="600" data-height="190"

\pgfspectra[ element=He, width=11cm, height=1.6cm, axis, axis step=40, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="600"
  data-height="190"
>
\pgfspectra[
  element=He,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  label
]
</script>

The axis step option controls the distance between the major wavelength labels.

Spectrum with a visible-color background

The back option controls the spectrum background.

The predefined values:

visible5
visible10
visible15
...
visible100

place the visible-spectrum colors behind the emission lines.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="620" data-height="200"

\pgfspectra[ element=He, back=visible100, width=11cm, height=1.6cm, axis, axis step=40, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="200"
>
\pgfspectra[
  element=He,
  back=visible100,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  label
]
</script>

No additional rainbow library is required

back=visible100 uses the built-in visible-spectrum shading of the main pgf-spectra package.

It does not require:

\usepgfspectralibrary{rainbow}

The separate rainbow library provides the different \pgfspectrarainbow command.

Hydrogen absorption spectrum

Use the absorption option to draw dark spectral lines over a continuous background.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="620" data-height="200"

\pgfspectra[ element=H, absorption, width=11cm, height=1.6cm, axis, axis step=40, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="200"
>
\pgfspectra[
  element=H,
  absorption,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  label
]
</script>

No additional library is required for absorption spectra.

Absorption spectrum of several elements

Several element symbols can be supplied in a list:

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="650" data-height="210" data-render-timeout="30000"

\pgfspectra[ element={H,He}, absorption, width=11.5cm, height=1.6cm, axis, axis step=40, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="650"
  data-height="210"
  data-render-timeout="30000"
>
\pgfspectra[
  element={H,He},
  absorption,
  width=11.5cm,
  height=1.6cm,
  axis,
  axis step=40,
  label
]
</script>

A spectrum containing several elements can require more processing than a single-element spectrum.

Wavelength range

The default visible range can be restricted with:

begin
end

Values are expressed in nanometres.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="620" data-height="200"

\pgfspectra[ element=H, begin=400, end=700, width=11cm, height=1.6cm, axis, axis step=50, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="200"
>
\pgfspectra[
  element=H,
  begin=400,
  end=700,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=50,
  label
]
</script>

The package supports spectral data beyond the visible region, from ultraviolet to infrared, when the required data is present in the runtime.

Reversed wavelength direction

The begin wavelength may be greater than the end wavelength.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="620" data-height="200"

\pgfspectra[ element=He, begin=700, end=400, width=11cm, height=1.6cm, axis, axis step=50, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="200"
>
\pgfspectra[
  element=He,
  begin=700,
  end=400,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=50,
  label
]
</script>

This reverses the horizontal wavelength direction.

Custom spectral lines

The lines option can draw explicitly selected wavelengths.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="620" data-height="190"

\pgfspectra[ lines={410,434,486,656}, width=11cm, height=1.5cm, axis, axis step=40 ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="190"
>
\pgfspectra[
  lines={410,434,486,656},
  width=11cm,
  height=1.5cm,
  axis,
  axis step=40
]
</script>

In pgf-spectra 3.x, the lines list can also contain a continuous range:

lines={400 to 500}

or a mixture of ranges and individual values:

lines={380 to 500,555,633}

Version compatibility

The start to end range syntax for lines was introduced in pgf-spectra 3.0.

If the console reports an unknown syntax or key, verify the version included in the deployed TikZJax runtime.

Neutral and ionized atoms

The charge option selects the atomic charge represented by the spectral data.

Example with ionized helium:

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="620" data-height="200"

\pgfspectra[ element=He, charge=1, width=11cm, height=1.6cm, axis, axis step=40, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="200"
>
\pgfspectra[
  element=He,
  charge=1,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  label
]
</script>

Use:

charge=all

to include the available neutral and ionized lines for the selected element.

The available charges depend on the spectral dataset included with the package.

Relative line intensity

Use relative intensity when the line height or intensity should reflect the available spectral data.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="620" data-height="200" data-render-timeout="30000"

\pgfspectra[ element=He, relative intensity, relative intensity threshold=.25, width=11cm, height=1.6cm, axis, axis step=40, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="200"
  data-render-timeout="30000"
>
\pgfspectra[
  element=He,
  relative intensity,
  relative intensity threshold=.25,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  label
]
</script>

The threshold prevents weak lines from becoming completely invisible.

Minimum line intensity

Use Imin to remove lines below a minimum intensity.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="620" data-height="200"

\pgfspectra[ element=He, Imin=.05, width=11cm, height=1.6cm, axis, axis step=40, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="200"
>
\pgfspectra[
  element=He,
  Imin=.05,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  label
]
</script>

Higher values display fewer spectral lines.

Brightness and gamma

The options:

brightness
gamma

adjust the visual appearance of the spectrum.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="640" data-height="210"

\pgfspectra[ element=He, back=visible50, brightness=.7, gamma=.8, width=11cm, height=1.6cm, axis, axis step=40, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="640"
  data-height="210"
>
\pgfspectra[
  element=He,
  back=visible50,
  brightness=.7,
  gamma=.8,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  label
]
</script>

Use these options carefully. Extreme values may make weak spectral lines difficult to see.

Axis options

Common axis options include:

axis
axis step
axis ticks
axis color
axis font
axis font color
axis unit

Example:

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="650" data-height="220"

\pgfspectra[ element=H, width=11cm, height=1.6cm, axis, axis step=40, axis ticks=4, axis color=gray, axis font color=blue!60!black, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="650"
  data-height="220"
>
\pgfspectra[
  element=H,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  axis ticks=4,
  axis color=gray,
  axis font color=blue!60!black,
  label
]
</script>

Custom axis label

pgf-spectra 3.x provides:

axis label
axis label text
axis label position

Example:

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="660" data-height="240"

\pgfspectra[ element=H, width=11cm, height=1.6cm, axis, axis step=40, axis label, axis label text={wavelength in nanometres}, label ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="660"
  data-height="240"
>
\pgfspectra[
  element=H,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  axis label,
  axis label text={wavelength in nanometres},
  label
]
</script>

Requires pgf-spectra 3.x

axis label, axis label text, and axis label position were introduced in version 3.0.

If the browser console reports:

I do not know the key '/pgfspectra/axis label text'

the deployed runtime probably contains an older package version.

Remove the option or update the runtime files.

Element label options

The label option displays the chemical symbol associated with the spectrum.

Additional label options include:

label position
label before text
label after text
label font
label font color

Example:

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="650" data-height="220"

\pgfspectra[ element=He, width=11cm, height=1.6cm, axis, axis step=40, label, label position=north west, label after text={ emission spectrum} ] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="650"
  data-height="220"
>
\pgfspectra[
  element=He,
  width=11cm,
  height=1.6cm,
  axis,
  axis step=40,
  label,
  label position=north west,
  label after text={ emission spectrum}
]
</script>

Reusable spectrum style

Use \pgfspectraStyle to configure options shared by several spectra in the same TikZJax block.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="680" data-height="380" data-render-timeout="30000"

\pgfspectraStyle[ width=11cm, height=1.3cm, axis, axis step=40, label ]

\pgfspectra[element=H]

\par\bigskip

\pgfspectra[element=He] 

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="680"
  data-height="380"
  data-render-timeout="30000"
>
\pgfspectraStyle[
  width=11cm,
  height=1.3cm,
  axis,
  axis step=40,
  label
]

\pgfspectra[element=H]

\par\bigskip

\pgfspectra[element=He]
</script>

Reset the style with:

\pgfspectraStyleReset

Each TikZJax block is compiled as an independent TeX document, so a style declared inside one block does not affect another block.

Several spectra versus several TikZJax blocks

Several spectra can be placed in one TeX block:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
>
\pgfspectra[element=H]

\par\bigskip

\pgfspectra[element=He]
</script>

However, separate blocks can be distributed between several workers:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
>
\pgfspectra[element=H]
</script>

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
>
\pgfspectra[element=He]
</script>

Use separate blocks when independent parallel rendering is more important than sharing one TeX document.

Use one block when the spectra must share local TeX state or appear as one inseparable figure.

Additional pgf-spectra libraries

The main \pgfspectra command does not require an additional pgf-spectra library.

The package also defines optional libraries:

data
pgfplots
tempercolor
rainbow

They are loaded inside the TeX source with:

\usepgfspectralibrary{library-name}

Several libraries can be loaded together:

\usepgfspectralibrary{data,tempercolor}

Runtime availability

An optional library works in TikZJax only when its library file and all its dependencies are present in the deployed dist/tex_files/ directory.

Loading:

data-tex-packages="pgf-spectra"

loads the main package, but an optional library can still fail if its separate runtime file was not included in the generated package catalogue.

Test optional libraries with console output enabled before publishing them as rendered documentation examples.

The optional rainbow library

The dedicated rainbow command is not the same feature as:

back=visible100

To use \pgfspectrarainbow, first load the optional library:

\usepgfspectralibrary{rainbow}

Then call:

\pgfspectrarainbow{2cm}

Complete TikZJax source:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-show-console="true"
>
\usepgfspectralibrary{rainbow}

\pgfspectrarainbow{2cm}
</script>

Warning

Keep this as a source example until the generated TikZJax runtime has been checked for the corresponding rainbow-library file.

For a rainbow-colored spectrum that uses only the main package, prefer:

\pgfspectra[
  element=H,
  back=visible100
]

Loading several LaTeX packages

Several packages can be declared with a comma-separated list:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra,physics"
>
% Source using both packages
</script>

They can also be declared with JSON:

<script
  type="text/tikz"
  data-tex-packages='{
    "pgf-spectra": "",
    "physics": ""
  }'
>
% Diagram source
</script>

Only load packages required by the current block.

Warning

A larger package list creates a larger TeX preamble.

It can increase rendering time, memory usage, and the possibility of package conflicts.

Global loading

Load pgf-spectra globally only when most diagrams on the site use it:

window.TikzJaxOptions = {
    tex: {
        texPackages: {
            "pgf-spectra": ""
        }
    }
};

After global loading, individual diagrams do not need:

data-tex-packages="pgf-spectra"

Performance

Global loading inserts:

\usepackage{pgf-spectra}

into every TikZJax document.

This means that ordinary TikZ diagrams also initialize the package and its spectral data.

Prefer local loading unless spectra are used throughout the site.

MkDocs fenced blocks

A fenced tikzjax block cannot contain HTML data-* attributes.

Therefore, fenced blocks using pgf-spectra work only when the package is loaded globally.

```tikzjax
\pgfspectra[
  element=H,
  width=10cm,
  height=1.5cm,
  axis,
  label
]
```

Important

For portable local loading, prefer:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
>
...
</script>

MkDocs Content Tabs

Draw the visible hydrogen emission spectrum.

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="600" data-height="190"

\pgfspectra[ element=H, width=11cm, height=1.6cm, axis, axis step=40, label ] 

=== "Question"

    Draw the visible hydrogen emission spectrum.

=== "Solution"

    <script
      type="text/tikz"
      data-tex-packages="pgf-spectra"
      data-width="600"
      data-height="190"
    >
    \pgfspectra[
      element=H,
      width=11cm,
      height=1.6cm,
      axis,
      axis step=40,
      label
    ]
    </script>

TikZJax automatically rescans MkDocs Material content tabs when they become visible.

MkDocs admonitions

Hydrogen absorption spectrum

<script type="text/tikz" data-tex-packages="pgf-spectra" data-width="600" data-height="190"

\pgfspectra[ element=H, absorption, width=11cm, height=1.6cm, axis, axis step=40, label ] 

!!! example "Hydrogen absorption spectrum"

    <script
      type="text/tikz"
      data-tex-packages="pgf-spectra"
      data-width="600"
      data-height="190"
    >
    \pgfspectra[
      element=H,
      absorption,
      width=11cm,
      height=1.6cm,
      axis,
      axis step=40,
      label
    ]
    </script>

Loader dimensions

Spectra are usually much wider than the default TikZJax loader.

Reserve suitable space with:

data-width="620"
data-height="200"

Example:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-width="620"
  data-height="200"
>
\pgfspectra[
  element=H,
  width=11cm,
  height=1.6cm,
  axis,
  label
]
</script>

These attributes affect only the loading placeholder.

They do not change the final spectrum dimensions.

The final dimensions are controlled by the package options:

width=11cm
height=1.6cm

Timeout and debugging options

Spectral diagrams can require more data files and more processing than a basic TikZ drawing.

A debugging block can use:

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-render-timeout="30000"
  data-disable-cache="true"
  data-show-console="true"
>
\pgfspectra[
  element=H,
  axis,
  label
]
</script>

Use:

data-disable-cache="true"

while changing an example.

Use:

data-show-console="true"

when diagnosing TeX, package, data-file, or runtime errors.

Use:

data-render-timeout="30000"

or a larger value for a complex spectrum.

Parallel rendering

TikZJax places uncached diagrams in a global rendering queue.

Several spectra can be compiled concurrently:

worker 1 -> hydrogen spectrum
worker 2 -> helium spectrum
worker 3 -> absorption spectrum

Each worker renders one diagram at a time.

When a worker finishes, it takes another diagram from the queue.

Each worker maintains its own in-memory cache of downloaded and decompressed TeX files.

The first pgf-spectra diagram handled by a worker may therefore take longer than later spectra assigned to the same worker.

Note

Spectral data cached by one worker is not automatically shared with the other workers.

This is an intentional consequence of worker isolation.

Tip

Local package loading remains fully compatible with parallel rendering.

The package declaration and spectrum options travel with the individual diagram when it is assigned to a worker.

Identical spectra

When several identical spectra are discovered while the same render is still pending, TikZJax can group them into one rendering operation.

The resulting SVG is then reused for every matching target.

The complete source and diagram dataset must match, including:

  • data-tex-packages;
  • local TikZ libraries;
  • dimensions;
  • timeout options;
  • cache options;
  • the exact \pgfspectra source.

Debugging

Enable TeX logs

<script
  type="text/tikz"
  data-tex-packages="pgf-spectra"
  data-disable-cache="true"
  data-show-console="true"
  data-render-timeout="30000"
>
\pgfspectra[
  element=H,
  width=11cm,
  height=1.6cm,
  axis,
  label
]
</script>

Clear the TikZJax SVG cache

Run this in the browser console:

indexedDB.deleteDatabase("TikzJax");
location.reload();

Inspect globally configured packages

window.TikzJaxOptions?.tex?.texPackages

Inspect the effective package version

The browser console may reveal the loaded package version in the TeX output when:

data-show-console="true"

is enabled.

This is useful when an option exists in the current manual but fails in the deployed runtime.

Missing main package file

A missing package generally appears as:

GET .../tex_files/pgf-spectra.sty.gz 404

Missing spectral data

A missing data dependency may appear as a request for a file such as:

GET .../tex_files/pgf-spectra.data.NIST.tex.gz 404

The exact filename depends on the package version and selected dataset.

Missing optional library

An optional library may produce a request resembling:

GET .../tex_files/pgf-spectra.library.rainbow.tex.gz 404

The exact name should be taken from the browser console.

Do not guess the filename when updating the runtime catalogue. Use the actual failed request.

Timeout

A timeout appears as:

TikZJax render timeout after 30000ms

Increase it locally:

data-render-timeout="45000"

or globally:

window.TikzJaxOptions = {
    renderTimeout: 45000
};

Common problems

Undefined control sequence \pgfspectra

The package was not loaded.

Add:

data-tex-packages="pgf-spectra"

or enable it globally.

Unknown /pgfspectra/... key

The option may not exist in the deployed package version.

For example:

I do not know the key '/pgfspectra/axis label text'

usually indicates that the runtime contains a version older than 3.0.

Check the package version, remove the unsupported option, or rebuild the runtime with the current package files.

A broken image appears without a useful message

Enable:

data-show-console="true"

and temporarily disable the SVG cache:

data-disable-cache="true"

Then reload the page and inspect the browser console.

A spectrum works without options but fails with advanced options

Start from the minimal form:

\pgfspectra[element=H]

Then add options one at a time:

\pgfspectra[element=H,axis]

\pgfspectra[element=H,axis,label]

\pgfspectra[
  element=H,
  axis,
  label,
  back=visible100
]

This makes it easier to identify the unsupported key or missing dependency.

The dedicated rainbow command is undefined

The main package does not automatically load the optional rainbow library.

Add:

\usepgfspectralibrary{rainbow}

before:

\pgfspectrarainbow{2cm}

If the diagram still fails, inspect the console for a missing optional-library file.

back=visible100 fails

back=visible100 belongs to the main \pgfspectra command and does not require the separate rainbow library.

A failure therefore more likely indicates:

  • an older or incomplete pgf-spectra installation;
  • a missing core package dependency;
  • a missing shading-related runtime file;
  • a TeX error elsewhere in the options;
  • a render timeout.

Use the browser console to identify the exact cause.

No spectral lines are visible

Check:

  • that the element symbol is valid;
  • that the selected wavelength range contains lines for the element;
  • that charge is available in the selected dataset;
  • that Imin is not too high;
  • that relative intensity threshold is not hiding weak lines;
  • that brightness and gamma are not making lines too dark.

Return temporarily to:

\pgfspectra[element=H]

to verify the basic runtime.

The axis is too dense

Increase:

axis step=40

or:

axis step=50

You can also reduce the number of minor ticks with:

axis ticks=4

The spectrum is clipped while loading

Increase:

data-width
data-height

These attributes reserve more space for the loader.

They do not resize the final spectrum.

The first spectrum is slower

The first worker rendering pgf-spectra must download and decompress the package, its spectral data, and its dependencies.

Later spectra assigned to the same worker can reuse those files from memory.

Changes are not visible

The previous SVG may be stored in IndexedDB.

Use:

data-disable-cache="true"

while debugging, or clear the TikZJax database manually.

Common options

Option Purpose
element=H Select an element
element={H,He} Combine several elements
charge=1 Select an ionized spectrum
charge=all Include all available charges
absorption Draw an absorption spectrum
back=visible100 Use the full visible-color background
width=11cm Set the spectrum width
height=1.6cm Set the spectrum height
begin=400 Set the starting wavelength
end=700 Set the ending wavelength
lines={410,434,486,656} Draw selected wavelengths
axis Display the wavelength axis
axis step=40 Set major-axis spacing
axis ticks=4 Configure minor ticks
label Display the element label
relative intensity Use relative line intensities
relative intensity threshold=.25 Set the minimum relative display intensity
Imin=.05 Filter weak source lines
brightness=.7 Adjust brightness
gamma=.8 Adjust gamma
line width=.8pt Set spectral-line width

Official documentation