How to adjust the size of the coordinate axis font?

[smallrain1996]

$ neper -T -n 100 -morpho "columnar(x)" -domain "cube(400,400,400)"
$ neper -V n100-id1.tess -datacellcol id -datacsyscoo -80:-80:-80 -showcsys 1 -datacsyslength 80 -datacsysrad 2 -print img

The above is a very simple command to model the side length not 1 but a larger number like 400?
We can adjust the length and radius of the axes so that the axes are visible, but X1 X2 X3 are not visible because they are too small.

Obviously I could add X1 X2 X3 myself using Photoshop. but I think Neper is the coolest software on my computer so I was hoping to know how to set this font size?

[rquey]

Actually, there is option -datacsysfontsize (default value 1), but it was not documented - it is now (version 4.2.1-8).

[smallrain1996]

Thank you very much for your reply！