Number of CUs, NCU, used for the Gaia DR1 photometric calibration.
|Instrum.||Scale||N rows||N strips||N gate/WC||N FoV||N AC||N time||N CU|
Notes. NCU is the product of all the other columns (number of CCD rows and strips, gate/WC configuration, FoV, AC bin, and time range). See Sect. 3 for the description of the instrument and for the definition of a CU.
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