Name: idB-rrrrrr-bc.fit, where rrrrrr is the imaging run number (of the calibration run which produced the vector), b is the filter used (u, g, r, i, or z), and c is the column location in the Imaging Array of the CCD which acquired the data (1-6).
Produced by: bias
Used by: ps, frames
Size: 8640 bytes per file. For a single calibration of all photometric chips, there are 30 files created for a total of 259.2 Kb.
When processing the data from an imaging run, the bias vectors from the most recent bias calibration run are used.
The pixel values are stored as unsigned integers. The TSCALE keyword gives the amount by which each pixel value has been multiplied; e.g., if TSCALE = 32, then each pixel value in the image is 32 times larger than the true value. This scaling allows us to calculate precise values while maintaining pure integers.
SIMPLE = T BITPIX = 16 NAXIS = 2 NAXIS1 = 2128 NAXIS2 = 1 BSCALE = 1 BZERO = 32768 BUNITS = 'ADUs x TSCALE' VERSION = 'XXX ' / Software version used. TSCALE = XXX / Scale factor to increase precision CAMCOL = XXX / Column in the imaging camera. CAMROW = XXX / Row in the imaging camera. RUN = XXX / Run which produced the vector. BIAS_ID = 'XXX ' / Bias pipeline run identifier. END