{
  "field": "P.speed",
  "v4_field": "P.speed_raw",
  "interpreted_unit": "mph",
  "quantity": "3D speed magnitude",
  "unit_status": "inferred_working_assumption_accepted_by_user",
  "conversion_to_mps": 0.44704,
  "raw_values_changed": false,
  "original_author_annotation": "m/s",
  "original_formula_confirmed": false,
  "original_internal_timebase_confirmed": false,
  "scope_verified_trials": 1440,
  "primary_analysis_field": "processed_speed_xyz_mps",
  "primary_analysis_unit": "m/s",
  "note": "This external annotation supplements the immutable v4 package. Conversion does not validate reset-first rows or jumps."
}