Hallo. I just wonder how to plot several Y-scales towards one X-scale. For instance a chemistry problem: on the Y-axis; pH, pe, [Fe], [Mn] on the X-axis; sea water depth I guess it is quit an easy question. In EXCEL it is easy to plot two Y-scales towards one X-scale. But more than two? Are there any programs out there which are easy to learn and a very strong in different types of diagrams? Matlab seem to be great for deeper applications, but also somewhat hard to get into to compare with EXCEL f.i. Are there any good introductory books for image creating and "diagraming" in MATLAB?