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On Jun 13, 2014, at 7:57 PM, Plessel, Todd <address@hidden> wrote: > Yes, LAY dimension and VGLVLS attribute are required (by the M3IO spec) > in all M3IO-format files, Thanks Todd. John, In that case, it would be great if M3IOConvention would just throw a more descriptive exception. As is, the dataset can’t be opened. Even IDV just shows a stack trace rather with no further indicator of what’s wrong with the dataset. Thanks, rbs -- Robert B. Schmunk Webmaster / Senior Systems Programmer NASA Goddard Institute for Space Studies 2880 Broadway, New York, NY 10025