--- header unit 0: primary ---
SIMPLE = T
BITPIX = 16
NAXIS = 2
NAXIS1 = 512
NAXIS2 = 1
BZERO = 3.27680000000000E+04
BSCALE = 1.00000000000000E+00
EXTEND = T / Extensions may be present
TSHIFT = 2048
RUN = 4274 / Imaging run number.
CAMCOL = 3 / Column in the imaging camera.
FILTER = 'u' / Filter (u, g, r, i, z, l, or t).
FIELD = 784 / starting field for this run
FF_ID = 'Wed Jun  2 08:35:40 2004' / a copy of PS_ID from supplied flatfie
VERSION = 'v5_5_11'
DERV_VER = 'v8_16'
PS_ID = '2005-11-11T09:46:07 12578 camCol 3'
ASTR_VER = 'v5_14'
BIAS_ID = '2001-12-24T12:06:17 16903'
SSC_ID = '2005-11-11T08:28:38 30483'