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Hi Lu- > Full Name: luxq > Email Address: address@hidden > Organization: Shanghai Typhoon Institute > Package Version: 2.6b2 build date:2008-11-23 14:18 UTC > Operating System: Windows XP > Hardware: Java: home: d:\Program Files\IDV_2.6b2\jre version: 1.6.0_07 > j3d:1.5.2 fcs (build4) > Description of problem: I set the contour interval value as 20m. > base valuse is 0 and maximum value is 320, minimum value is -240. > But why the contour line whose value is under 0 is not changed to dash line? What are the dimensions of the original grids. You can check under the Properties dialog for the Data Source. We have a known bug where the dashing won't work for very high resolution grids and perhaps that is what you are seeing. Don Murray Ticket Details =================== Ticket ID: SKY-233585 Department: Support IDV Priority: Normal Status: Open