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Fig. 5


Left, system temperatures (Tsys) measured at Los Alamos vs. airmass. Straight lines are fits of linear models to the lower envelopes of the Tsys distributions. The receiver temperature is estimated as the extrapolation of the lower envelope to a null airmass. Right, zenith opacity (i.e., opacity multiplied by the sine of the antenna elevation) at Los Alamos vs. time, as estimated using Eq. (1).

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