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![Histograms of OBS PPT over US [17.5N:40N, 130W:70W] for 1930-1960 (green), 1961-1989 (red). Vertical lines are means](http://www.met.rdg.ac.uk/~dan//parc.php?path=&image=ppttst_03_12_04.gif&title=Histograms of OBS PPT over US [17.5N:40N, 130W:70W] for 1930-1960 (green), 1961-1989 (red). Vertical lines are means&google=0Bx-7Nv8ocO25X2V0UTFodWVpZzQ&link=/home/dan/papers/P4/Figs/ppttst.ps.gz "Histograms of OBS PPT over US [17.5N:40N, 130W:70W] for 1930-1960 (green), 1961-1989 (red). Vertical lines are means")
