--- header unit 0: primary ---
SIMPLE = T / Primary Header created by MWRFITS v1.8
BITPIX = 16
NAXIS = 0
EXTEND = T / Extensions may be present
TREE = 'dr9' / tree version
PMVERS = 'v2_11' / PM version
--- header unit 1: image ---
XTENSION = 'IMAGE' / Image Extension created by MWRFITS v1.8
BITPIX = 16
NAXIS = 0
PCOUNT = 0
GCOUNT = 1