Fig. 6
Time evolution of monthly mean PWV from the APEX radiometer using all values (open circles) and only the values below 1.2 mm (squares) averaged over 2007 and 2009. The RMSE and the mean absolute fractional error between the PWV_GF and the PWV_A for the range 0–1.2 mm are shown in black stars and triangles, for both years, respectively. The RMSE and fractional error values for December are just for 2007 since GOES radiation data for that month were not available in 2009.
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