The description above assumes that the source signal comes only from the
(so-called) *signal* sideband. This is of course not true for continuum
radiation. If we neglect spectral index effects, one can derive the proper
calibration of a continuum source from the description above. should
be multiplied by

(15) |

Similarly for spectral line observations, if you are interested in the
image band, should be multiplied by

(16) |

Gildas manager 2018-12-15