I'm trying to add a second x-axis on top of my graph. I followed the instructions I found in the "Knowledge base" but this doesen't work. In particular, the assignment of new tick positions, using a the LabTalk script line does not function. Any suggestions ? Thanks ps: the second x-axis is non-linear and is provided as a column of values assigned for specific values of the 1st x-axis, which are positioned in different positions than the 1st axis labels.