Hi,
I have survey data with LRUD's for the from-station as follows:

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centerline
data normal from  to  length  compass  clino left right up down
a  b  10 90 0 2 0 2 0
b  c  10 90 0 0 2 2 0 
c  d  10 90 0 2 0 2 0
endcenterline
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Since LRUD is measured at from-station this data indicates that station a and c is positiond at the right cave wall and station b is positioned at the left wall (station d is undefined). 

In the generated map however the cave walls is drawn so that station b is positioned at the right wall and station c is positioned at the left wall (see attached pdf). It seems that the LRUD's are applied to the to-station instead of from-station (except for station a). Is it possible to change this behavior?

I'm using the following thconfig file to export a map with walls generated by the LRUD values:
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source data.th

layout my_layout
colour map-fg [100 0 0]
colour map-bg [100 100 100]
debug all
endlayout

export map -projection plan -o map.pdf -layout my_layout
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/niklas