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/GAINIMAGE receiverName
/GAINIMAGE NO

Character :: receiverName        ! 

Choices for receiverName are:
A100 A230 B100 B230 C150 C270 D150 D270 

Option of CALIBRATE:
calibrate the image-to-signal gain ratio for the named receiver.

This works only for single-pixel heterodyne receivers, with continuum
backends connected, and can be done for only one receiver at a time.

The subscan sequence for this special calibration is:
    ambient load with LSB setting
    cold    load with LSB setting
    ambient load with USB setting
    cold    load with USB setting

/GAINIMAGE NO deselects this special calibration mode.
This is the default, e.g., for CALIBRATE /DEFAULT.

IMPORTANT NOTE: after measuring the image-to-signal gain ratio, 
remember to turn this option off again for normal calibrations:
e.g., CALIBRATE /GAINIMAGE NO or CALIBRATE /DEFAULT.
.fi

