[Therion] Depth labels different from altitude

[vladimirg at mail.bg]

Hi


I am trying to display a depth bar on the extended profile that starts from
0. Not to show the altitude, but only the depth of the cave relative to the
entrance.


This is not a problem if I use the FIX command like:
 centerline
 cs long-lat
 fix 1 11:22:33.3 22:33:44.4 1000 # fix point 1to the WGS coordinates and
altitude


The thing is that I don't want to put 0 for an altitude because it seems
useful to have the real altitude for some 3D, overlays, etc


So I would like to use FIX with the altitude, but on the extended to see
the cave depth starting from 0.
I tried with some combinations of grid-origin like this, but I still see
the altitude in the depth bar:
 layout xelev
 grid bottom
 cs long-lat
 grid-origin 0 0 0 m


Is there a way to do it?


Thanks


Vladimir




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