{
  "name": "gold_512_npy_bin4",
  "shape": [
    512,
    512,
    48,
    48
  ],
  "dtype": "uint16",
  "sampling": [
    0.5,
    0.5,
    1.84,
    1.84
  ],
  "units": [
    "A",
    "A",
    "mrad",
    "mrad"
  ],
  "bin_factor": {
    "scan": 1,
    "det": 4
  },
  "original_shape": [
    512,
    512,
    192,
    192
  ],
  "original_sampling": [
    0.5,
    0.5,
    0.46,
    0.46
  ],
  "source": "Arina 4D-STEM master /home/owner/ssd/data/bob/20260423_gold_drift_v6_4dstem_pair/gold_004_master.h5 (drift-pair acquisition; sibling session 20260408_gold_4dstem_512_ssb/dataset.yaml supplies optics)",
  "purpose": "workshop / Colab demo - full real-space, detector-only bin",
  "voltage_kV": 300,
  "camera_length_mm": 91,
  "probe_semiangle_mrad": 30,
  "mag_MX": null,
  "rotation_deg": 0.0,
  "voltage_kV_source": "confirmed via session HAADF EMD (20260423/0072-*.emd, AccelerationVoltage)",
  "probe_semiangle_source": "confirmed via session HAADF EMD (BeamConvergence 0.02999 rad)",
  "camera_length_source": "confirmed via session HAADF EMD (CameraLength 0.091 m)",
  "scan_sampling_A_source": "operator pattern from sibling 20260408 SSB calibration.json; not per-file calibrated for this 20260423 drift acquisition",
  "survey_haadf_mag_MX": 2.6,
  "survey_haadf_fov_nm": 38.1
}