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Fig. 8
SPQR ratio for the 200-μm transmission for all the sites between 2008 and 2010. The mean values between 2008 and 2010 are Dome A 3.6, Dome C 2.7, South Pole 1.3, Cerro Chajnantor 1.1, Chajnantor Plateau 0.7, Cerro Macon 0.7, Mauna Kea 0.6, Summit (Greenland) 0.6, and Yangbajing (Tibet) 0.3.
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