[Therion] ceiling step in the wrong direction when exported from topodroid

[Tarquin Wilton-Jones]

> I've noticed that when I export sketches from Topodroid to Therion all
> of the ceiling step lines are in the wrong direction. it doesn't happen
> in the other lines...


Are you sure it's not just that TopoDroid or Therion uses a symbol set
that shows the "lower" and "higher" side using the opposite notation
from what you expect (and opposite to what Therion uses by default)?

Looking through the Therion symbols file:
https://therion.speleo.sk/wiki/_media/therion_symbols_20130407_.pdf
NZSS and UIS default to having the tail of the symbol in one direction,
while SKBB has it the other way. Therion seems to default to using SKBB
notation, while TopoDroid probably uses UIS.

Now that is confusing, and I have probably been using the wrong
direction all this time, since I just left it on the defaults, In the UK
at least, people seem to use the UIS version, so I have just been
setting "reverse" on the lines as needed...