Thanks so much, I am using ArcMap 10.5.1 Background processing enabled File Geodatabase? I made a new gdb specifically for the contours, if that is what you mean. Installed memory RAM 6GB (5.89 usable), (I am not storing any pics, vids or anything with a lot of data) I have not tried a smaller section, but I will. Thanks again, and my apologies for not mentioning that background info, I forget that is sometimes needed. Cheers
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