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Graphic: 
We've seen this problem before (CASES99/OASIS98): a temperature error on the ASTER barometers (but not PAM). Attached is a plot which shows the difference between the ASTER and PAM barometers on the top panel. The bottom panel is the same after correcting using: x <- dat("P") x[,1] <- x[,1] + (1/7)*dat("T")[,1] - 0.8 (i.e., a 1mb change per 7degC change and a small bias). In the future (even now??), we really should use the PAM barometers for ASTER -- 5mb is getting to be a large error.