Fits a least-squares plane to the picture, and subtracts
the plane from the picture. A wedge-shaped overall
density profile can thus be removed from the picture.
Example.
USAGE
.OPERATION: RA
.INPUT FILE: PIC001
[Enter the name of the file that needs to be corrected.]
.OUTPUT FILE: IMG043
[Output file name.]
NOTES
This operation should be used for pre-processing
whenever the autocorrelation function has a "rooftop"
appearance.
The result of the statistical F-test of the multiple
correlation coefficient is calculated.