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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Forum: Origin Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies I have an XY grid of points forming a square ring, and each of those points is assigned a Z value. This means that the inside of this square is completely devoid of data. Origin insists on creating fake data to put in there. Problem only appeared when I increased the number of points in that square ring to roughly above 4000. There was some fake data before (in the projection onto XY, which I am also using) but that was solved with smoothing. This time smoothing can't help. It's not an issue with the code I'm using. If I sort the worksheet and simply scroll down to the areas which have fake data on the graph, there aren't any entries in the XY grid corresponding to them. If possible I'd like to avoid having to do additional pre-processing, like by filling in the middle and assigning 0 everywhere and cutting it out with the colormap, as this would bloat the filesize massively. Surely there's a way to fix this? Here's the square ring I'm talking about. [img]https://my.originlab.com/ftp/forum_and_kbase/Images/image_2024-11-14_183700661.png[/img] The graph -- random spikes in the middle. On the projection I'm additionally showing the same grid using the same worksheet data, which also shows there shouldnt be any points in the middle. [img]https://my.originlab.com/ftp/forum_and_kbase/Images/image_2024-11-14_184013421.png[/img] View from above for completeness [img]https://my.originlab.com/ftp/forum_and_kbase/Images/image_2024-11-14_184123759.png[/img] I'm at a loss, I tried searching for a solution but I couldn't come up with any query to get any answers. Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2024 (64-bit) SR1 10.1.0.178 (Student Version) Operating System: Windows 10   Check here to subscribe to this topic.