[Therion] cavelength and unsurveyed passages

[Martin Gerbaux]

Hi

I would like that in the legend, cavelength information corresponds to
length of centerlines plus length of other explored passages (referenced
as station 2_45 "départ méandre étroit" continuation explored 20m).
I did not succeed in getting it many several searches and try.
Is there a way to do this ?

Regards

Martin
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