Fig. 1
Zenith atmospheric transmission for precipitable water vapour (pwv) values of 0.2, 0.5, and 1 mm at Llano de Chajnantor. Values are plotted from the Atmospheric Transmission at Microwaves (ATM) model (Pardo et al. 2001). Frequency coverage of the observations is shaded in grey for the sidebands. Each sideband consists of 4 GHz continuous frequency coverage. The rest frequency of the 313–220 H2O line is 183.310 GHz.
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