How to add top x-axis in xmgrace?

Question

I have plotted a graph with xmgrace, the x-values are in linear scale of nm (for wavelength). I want to add a top reciprocal x-axis in eV units.

The formula to transform nm to eV is:

$eV=\frac{1240}{nm}$

I could not find a way to add another x-axis without adding a new data set.

score 1 · Accepted Answer · answered Apr 21 '20 at 16:01

This is possible without any particular hack which, since we are dealing with xmgrace, is quite amazing :-) Here is how you do it:

1 Answers1