{
  "pixels_per_wavelength": 35.0,
  "wavelength_nm": 4.365640788732393,
  "x0_nm": -4.053809303822937,
  "y0_nm": 0.0,
  "grid_ny": 222,
  "grid_nx": 66,
  "formula": {
    "pitch_nm": "wavelength_nm / pixels_per_wavelength",
    "x_nm": "x0_nm + ix * pitch_nm",
    "y_nm": "y0_nm + iy * pitch_nm"
  }
}