--- header unit 0: primary ---
SIMPLE = T
BITPIX = 16
NAXIS = 2
NAXIS1 = 2048
NAXIS2 = 1
BZERO = 3.27680000000000E+04
BSCALE = 1.00000000000000E+00
EXTEND = T / Extensions may be present
TSHIFT = 2048
RUN = 4797 / Imaging run number.
CAMCOL = 4 / Column in the imaging camera.
FILTER = 'z' / Filter (u, g, r, i, z, l, or t).
FIELD = 191 / starting field for this run
FF_ID = 'Thu Apr  9 10:05:51 2009' / a copy of PS_ID from supplied flatfie
VERSION = 'v5_4_43'
DERV_VER = 'NOCVS:v8_16'
PS_ID = '2009-05-16T10:43:56 14818 camCol 4'
ASTR_VER = 'NOCVS:v5_24'
BIAS_ID = '2001-12-24T12:06:17 16903'
SSC_ID = '2009-05-16T10:23:37 04903'