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<p>Dear colleges</p>
<p>can any one help me about <span>cd_calendar, my data is 2b-geoprof (cloudsat) product , i don't know what can i do for plot them:<br>
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<div><span style="font-family: Arial, Helvetica, sans-serif;">ncl 27> alt40 = f->Height_2B_GEOPROF </span><br>
<span style="font-family: Arial, Helvetica, sans-serif;">ncl 28> kalt = dimsizes(alt40)</span><br>
<span style="font-family: Arial, Helvetica, sans-serif;">ncl 29> time = f->Profile_time_2B_GEOPROF</span><br>
<span style="font-family: Arial, Helvetica, sans-serif;">ncl 30> ntime = dimsizes(time)</span><br>
<span style="font-family: Arial, Helvetica, sans-serif;">ncl 31> yyyymm = cd_calendar(time,-1)</span><br>
<span style="font-family: Arial, Helvetica, sans-serif;">fatal:cd_calendar: no 'units' attribute provided</span><br>
<span style="font-family: Arial, Helvetica, sans-serif;">fatal:["Execute.c":8638]:Execute: Error occurred at or near line 31</span><br>
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