### FLATFIELD

Flatfield SCUBA-2 data

#### Description:

This routine flatfields SCUBA-2 data. Each input file is propagated to a corresponding output file which is identical but contains flatfielded data. If the input data are already flatfielded, the user will be informed and no action will be performed on the data.

#### Parameters:

Group of files to be used as bad bolometer masks. Each data file specified with the IN parameter will be masked. The corresponding previous mask for a subarray will be used. If there is no previous mask the closest following will be used. It is not an error for no mask to match. A NULL parameter indicates no mask files to be supplied. [!]
Method to use to calculate the flatfield solution. Options are POLYNOMIAL and TABLE. Polynomial fits a polynomial to the measured signal. Table uses an interpolation scheme between the measurements to determine the power. [POLYNOMIAL]
The order of polynomial to use when choosing POLYNOMIAL method. [1]
Signal-to-noise ratio threshold to use when filtering the responsivity data to determine valid bolometers for the flatfield. [3.0]
If true the previous and following flatfield will be used to determine the overall flatfield to apply to a sequence. If false only the previous flatfield will be used. A null default will use both flatfields for data when we did not heater track at the end, and will use a single flatfield when we did heater track. The parameter value is not sticky and will revert to the default unless explicitly over-ridden. [!]
Input files to be uncompressed and flatfielded. Any darks provided will be ignored.
Control the verbosity of the application. Values can be NONE (no messages), QUIET (minimal messages), NORMAL, VERBOSE, DEBUG or ALL. [NORMAL]
Output file(s).
##### OUTFILES = LITERAL (Write)
The name of text file to create, in which to put the names of all the output NDFs created by this application (one per line). If a NULL (!) value is supplied no file is created. [!]
A group expression containing the resistor settings for each bolometer. Usually specified as a text file using " ^" syntax. An example can be found in $STARLINK_DIR/share/smurf/resist.cfg [$STARLINK_DIR/share/smurf/resist.cfg]