Improve plot labels with LaTeX mathematical notation for physical units

[Copilot]

• Analyze all atlas YAML configuration files to identify labels needing LaTeX formatting
• Update y_labels with proper LaTeX math notation for units
• Update x_label with proper LaTeX math notation for units
• Ensure all physical units use LaTeX format (e.g., $\mathrm{MeV}$, $\mathrm{cm}^2$, etc.)
• Test that all atlas configuration files still load correctly after changes
• Verify changes maintain consistency with existing LaTeX patterns in the codebase
• Fix backslash escaping issue - matplotlib requires single backslashes in parsed strings

Summary of Changes

Successfully updated 24 atlas configuration YAML files with proper LaTeX formatting for all plot labels containing physical units.

Backslash Escaping Fix (Latest Commit)

Fixed an escaping issue where quadruple backslashes (\\\\) in YAML were creating double backslashes in the parsed strings, which matplotlib's mathtext parser couldn't handle. Changed to double backslashes (\\) which correctly produce single backslashes after YAML parsing.

Technical Details:

• YAML parsing: \\ in file → \ in Python string (correct)
• Previous error: \\\\ in file → \\ in Python string → matplotlib parse error
• Matplotlib expects: $\left[\mathrm{cm}^{-2}\cdot\mathrm{s}^{-1}\right]$ (single backslashes)

Files Fixed:

19 files with corrected backslash escaping:

• ASPIS-Fe88, FNG-BKT, FNG-HCPB, FNG-SDDR, FNG-SS, FNG-SiC, FNG-W
• FNS-TOF, HCPB_TBM_1D, IPPE-CF, IPPE-DT
• ITER_1D, ITER_Cyl_SDDR, Oktavian, Simple_Tokamak
• Sphere, SphereSDDR, Tiara-BC, WCLL_TBM_1D

Test Results:

✅ All 25 atlas processor tests now pass
✅ All configuration files load successfully
✅ LaTeX labels render correctly in matplotlib plots
✅ 144 total tests passing (only 1 unrelated network test failure)

The plot labels now use professional mathematical notation that matplotlib can correctly render.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Feature request] - Improve plot labels</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
At the moment there are a number of benchmark where the quantity on the y axis is not expressed using math symbols.

Describe the solution you'd like
Go through all atlas configuration files and ensure that the "LateX" math convention is used to express units in order to improve the quality of the plots.

</issue_description>

<agent_instructions>in theory, it should only affect YAML files.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #406

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch copilot/fix-b669545b-7661-4162-9b3b-f18b11b26e9d

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[alexvalentine94]

@copilot our tests are not passing?

[Copilot]

@copilot our tests are not passing?

Fixed in commit d1a0e82. The issue was incorrect backslash escaping - I had used quadruple backslashes (\\\\) in YAML which resulted in double backslashes in the parsed strings, causing matplotlib's mathtext parser to fail. Changed to double backslashes (\\) which correctly produce single backslashes after YAML parsing. All 25 atlas processor tests now pass.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
see 4 files with indirect coverage changes

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[alexvalentine94]

Thanks @copilot!

[dodu94]

plots are improved as expected