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Maureen, I imported your data into a file, and plotted it in sfgram with the following values: SFFILE = maureen.gem DATTIM = 21/09-22/09-0100 STATION = ME2K2 TRACE1 = DWPF;TMPF/4;2 TRACE2 = PMSL/4 TRACE3 = ;BRBK/5 TRACE4 = RELH/7/0;100 TRACE5 = P01I/22/0;2 NTRACE = 5 TAXIS = first-last-1;3;3;1 BORDER = 1/1/1 MARKER = 0 TITLE = 4/1/ME2K2 PAST 24 HOUR METEOGRAM - 21/0900-22/0900 EST CLEAR = YES DEVICE = xw PANEL = 0 TEXT = .90/21//sw The dattim string above does filter the data at the top of the hour in my plot (I'll attatch the gif). I also ran with: DATTIM = 21/09-22/09 Without specifying a time step interval, I get all values. At this point, I've tested the plot under Solaris and Irix and don't seen to be able to duplicate your problem. I'll attatch the gempak file I used above, and you can try with the above sfgram values to see if things still don't work. The only 2 things I see asstrange are your TIMSTN value in the sfcfil invokation, and you had spaces between the "-" characters in the dattim string in the email you sent earlier. I created the surface file with TIMSTN = 200/2000 (you specified 300 times...200 is the max), but I can't see how that would cause your problem. Anyhow, try using the file I create with the values I have above for sfgram. If you still see a problem, then we may need to see if your sfgram program is somehow different. Otherwise, we probably need to focus on the file creation. Steve Chiswell Unidata User Support