Documentation on tpgains

Task: tpgains
Purpose: Estimate antenna gains from total power measurements.
Categories: tpower, antenna gains

Key: vis
        Name of input visibility data file. No default.

Key: tgain
        The total power is modeled to be correlated with the atmospheric
        phase noise. tgain gives the total power in units of Kelvin/radian.
        Default value for millimeter wavelengths is tgain=0.5 K/radian.

Key: refant
        The gain of this antenna is set to cmplx(1.,0.).
        	Default is antenna 1.

Key: out
       Name of output calibration file. The default is to write the gain
       corrections into the input visibility file.