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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 Nernst[/i] [br]Hello, I would like to create a simple but specific kind of plot for my protocol. The data originates from protein chromatography and contains: - the uv-absorption of substances/proteins within the solution - usally the Y-Axis, - the volume that has gone throught the system - in my case the X-Axis, - and fractioning of specific amounts of volume, starting at a specific moment I can easily create a plot containing the first two rows of data. Now I would like to introduce a second X-Axis into the plot, preferably at the top or above the normal (first) X-Axis, showing the fractioning in respect to the first X-Axis, maybe drawling straight lines, creating columns that are called "FractionX". I hope the description of what I would like to do is sufficient. My question of course is: How do I add a second X-Axis which contains 2 rows of data. The data looks like this by the way: Column Y1 shows the start of the first fractioning in ml, 50.050, 50.060, et. Column Y2 shows the fraction-name, F1, F2, etc. Hope some one can give me a soltuion to this. :) [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.