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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Antispam question: What do MOONwalk and MOONdance have in common? Answer: 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 Message: * HTML is OFF * Forum Code is ON [quote][i]Originally posted by brocco00[/i] [br]Hello, I am having problems with the non-negative off-diagonals error message. I've read the FAQ and the manual, but have been unable to fix the problem. I am trying to simulate the capacitance matrix of two small shapes sitting above a ground plane. Below is my file. Can anyone tell me what I am doing wrong? Do I need to include some FR4 in the model? Thanks in advance! 0 tram_switcher Q offender 0.0 .0086 0.0013 .0086 .0086 0.0013 .0086 0.0 0.0013 0.0 0.0 0.0013 Q offender .0086 0.0 0.0013 0.0 0.0 0.0013 0.0 0.0 0.0017 .0086 0.0 0.0017 Q offender 0.0 0.0 0.0017 0 0.0086 0.0017 .0 0.0086 0.0013 0 0 0.0013 Q offender .0086 .0086 0.0017 0.0086 0.0086 0.0013 .0 0.0086 0.0013 0 0.0086 0.0017 Q offender .0086 .0086 0.0017 0.0086 0.0086 0.0013 .0086 0.0 0.0013 0.0086 0.00 0.0017 Q offender 0.0 .0086 0.0017 .0086 .0086 0.0017 .0086 0.0 0.0017 0.0 0.0 0.0017 Q victim .015 .0058 0.0013 .0188 .0058 0.0013 .0188 .002 0.0013 .015 .002 0.0013 Q victim .015 .0058 0.0013 .0188 .0058 0.0013 .0188 .0058 0.0017 .015 .0058 0.0017 Q victim .0188 .0058 0.0013 .0188 .002 0.0013 .0188 .002 0.0017 .0188 .0058 0.0017 Q victim .0188 .002 0.0013 .015 .002 0.0013 .015 .002 0.0017 .0188 .002 0.0017 Q victim .015 .0058 0.0013 .015 .002 0.0013 .015 .002 0.0017 .015 .0058 0.0017 Q victim .015 .0058 0.0017 .0188 .0058 0.0017 .0188 .002 0.0017 .015 .002 0.0017 Q g_plane -0.050 -0.050 0.0 -0.050 0.050 0.0 0.050 0.050 0.0 0.050 -0.0500 0.0 Q g_plane -0.050 -0.050 0.0 -0.050 0.050 0.0 -0.050 0.050 -0.001 -0.050 -0.050 -0.001 Q g_plane -0.050 0.050 0.0 0.050 0.050 0.0 0.050 0.050 -0.001 -0.050 0.050 -0.001 Q g_plane 0.050 0.050 0.0 0.050 -0.0500 0.0 0.050 -0.0500 -0.001 0.050 0.050 -0.001 Q g_plane -0.050 -0.050 0.0 0.050 -0.0500 0.0 0.050 -0.0500 -0.001 -0.050 -0.050 -0.001 Q g_plane -0.050 -0.050 -0.001 -0.050 0.050 -0.001 0.050 0.050 -0.001 0.050 -0.0500 -0.001 [/quote]   Check here to include your profile signature.