# Energy ~17 keV
Sample: Na2[Fe(CN)5NO]2H2O (SNP)
Unit cell (at 220K): 
snp_cell = Cell.orthorhombic(6.179, 11.877, 15.5496)


def hkl_to_d(hkl):
    """used to introduce extra symmetry elements that pyFAI cell cannot take into account"""
    h, k, l = hkl
    # return snp_cell.d(hkl)
    if h == 0 and abs(k + l) % 2 == 1:
        return np.nan
    if k == 0 and abs(h + l) % 2 == 1:
        return np.nan
    return snp_cell.d(hkl)


dataset0001: scan0001 & scan0002
  - sample scan to find best overlap (fixed goniometer angle)
  - each pulse is 3us long
  - 10 pulses per image
dataset0002: scan0001
  - images over 180 deg (1 deg/step)
  - each pulse is 3us long
  - 5 pulses per image
dataset0007: scan0001
  - images over 180 deg (1 deg/step)
  - each pulse is 1us long
  - 3 pulses per image
  - 10 images per scan point