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Make frequency labels readable at narrow and wide plot sizes - #15
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This was referenced Oct 3, 2026
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Closes #12.
The default log axis labels nearly every grid line and applies an automatic kHz prefix, crowding low-frequency labels. A custom frequency axis keeps the log grid while choosing labels according to available pixel width. It uses Hz below 1 kHz and kHz above it. Both spectrum and correction plots share the axis; zoom and pan still use the existing plot view.
These screenshots use generated sample curves. The smallest window the current controls allow is 911 × 606; the larger view is 1120 × 800.
Validation: 12 tests passed; Ruff check and format passed. I also checked labels at plot widths of 320, 500, 800, and 1100 pixels and zoomed both plots to 800–4000 Hz.