--- 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 = 3173 / Imaging run number.
CAMCOL = 1 / Column in the imaging camera.
FILTER = 'r' / Filter (u, g, r, i, z, l, or t).
FIELD = 448 / starting field for this run
FF_ID = 'Wed Jun  2 13:02:35 2004' / a copy of PS_ID from supplied flatfie
VERSION = 'v5_5_11'
DERV_VER = 'v8_16'
PS_ID = '2005-11-08T19:48:03 29351 camCol 1'
ASTR_VER = 'v5_14'
BIAS_ID = '2001-12-24T12:06:17 16903'
SSC_ID = '2005-11-08T18:02:39 19881'