Contrast vs Laser power
amplitude / offset · higher is better
Linewidth vs Laser power
2×HWHM (kHz) · lower is better
Figure of Merit vs Laser power
contrast × 10⁶ / (linewidth × 10³) · higher is better
Example Lorentzian fit @ 60 µW
best FoM = 11.3 ppm/Hz · R² = 0.9856