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If it's important to show where the missing values are, one could always present two renderings to the user - one, a 2D view of perhaps just plotted values or something that shows where the missing values are, and the other a 3D surface created, as you indicated, from only non-missing values. tom -- Tom Whittaker (tomw@xxxxxxxxxxxxx) University of Wisconsin-Madison Space Science and Engineering Center Phone/Voicemail: 608/262-2759 Fax: 608/263-6738
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