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Load calibration and determination of the zenith opacity
The hot and cold load as well as the atmosphere in a region devoid of
signal are measured in turn. From Eq. 2, it is easy to show
that

(11) 
where

and
are the RayleighJeans temperature of the loads;

and
are the associated measured counts.
From this equation, we deduce
. Using an atmospheric model and
Eqs. 79, the total opacity of the
atmosphere at signal and image frequencies are then fitted.
Gildas manager
20140701