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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 Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by D650-1349-EFD3-30C7[/i] [br]I am trying to plot the profile (lambda x) of a 2D FFT image on a 2D graph with pixel values on a bottom X axis (ranging from -255 to 256) and the corresponding wavelength values (lambda (nm)) on a top X axis (here ranging 0.13 ... +inf ... 0.13). I also want to have some precise values written on the top axis with tick-indexed dataset (which I tried to do using Tick labels > Type: Tick-indexed dataset). I have tried to use a reciprocal X axis at the top, but the problem is that the value corresponding to 0 at the bottom would be infinite at the top. I also tried to have a 2nd and a 3rd layer corresponding respectively to the [-255; 0[ and ]0; 256] intervals, but it does not seem to work (top axis with a wrong scale or indexed ticks at the wrong place), even when trying to introduce some breaks towards infinity. Could you please help me with it? Yann Origin Ver.: 8.0 SR6 Operating System: XP [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.