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Bao Qing, Where to begin? First off, this might have been more approriately directed to the GRADSUSR mailing list. Details for joining at: http://grads.iges.org/grads/ In any case, it's really hard to diagnose this problem without the exact error messages from GrADS, and the output from running "ncdump -v time" on your file. I'm beginning to suspect, since you didn't share a code snippet that did it, that you actually didn't write out the time coordinate values. -Hoop
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