src/calibration.json

{
  "slope": 0.792112,
  "intercept": 0.250292,
  "description": "calibrated_diameter = slope * raw_diameter + intercept",
  "n_samples": 60,
  "dataset": "10 people x 3 fingers x 2 shots, caliper ground truth",
  "raw_mae_cm": 0.1578,
  "calibrated_mae_cm": 0.0601,
  "cv_mae_cm": 0.0601
}