There is a selection in the Graph ops toolbox that should make it easier to set up the 2 graphs. This is also how to plot data sets in different scales against an axis on the right an an axis on the left. Yes, Xmgr has all these features. Here is how, the following is quoted from the online help provided with Xmgr v3.0 and higher. Changing fonts within a string To change fonts within a string precede the font number listed below by a backslash.
Font selection is current for the remainder of the string or until the next font change.
There are discrepancies between the two sets of fonts and of this writing, there are problems with the mapping of Greek and special characters. Complex Roman on screen, maps to Times-Roman. Complex Italic on screen, maps to Times-Italic. Triplex Italic on screen, maps to Times-BoldItalic. Simplex on screen, maps to Helvetica.