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/GAINIMAGE gainImage [dB]

Specify the gain ratio of image to signal sidebands.

Real      :: gainImage         ! 

If "dB" is added after the value, the ratio is assumed to be in dB,
otherwise a decimal fraction.

Simple standard values for these gain ratios can be found on the IRAM
30-m web pages (Telescope Summary). If you need accurate values for the
single-pixel heterodyne receivers, you should measure them with:
CALIBRATE /GAINIMAGE receiverName
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