Atmospheric phase stability has been measured at Chajnantor (e.g., Radford & Holdaway 1998) and Pampa la Bola (e.g., Ishiguro 1998) for many years now with Site Test Interferometers (STIs - see Ishiguro et al. 1989; Radford et al. 1996). A preliminary analysis of these data showed Chajnantor had smaller phase fluctuations than Pampa la Bola (Holdaway et al. 1997), but only 6 weeks worth of data were included in that analysis. Given the more extensive data set available now, it seems appropriate to make a more complete comparison.
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