This is the trick! 

Thanks!

Martin

> 22. 10. 2020 v 13:23, Xavier Robert <xavier.rob...@univ-grenoble-alpes.fr>:
> 
> Hi,
> 
> Or a possibility : In one of your th2 for the plan, draw the missing 
> symbol(s) from your plan that appears in your extended elevation, but draw 
> them outside of the cave’s walls, and with the option -clip on. 
> I have not tried, but they should then appear in the legend of your plan-pdf, 
> but not in the plan view.
> 
> Cheers,
> 
> Xavier
> 
>> Le 22 oct. 2020 à 13:00, Tarquin Wilton-Jones via Therion 
>> <therion@speleo.sk> a écrit :
>> 
>> On 22/10/2020 11:44, Martin Sluka via Therion wrote:
>>> Sorry, invisible symbols are not included in legend.
>> 
>> you might be able to include a custom symbol that looks the same, which
>> chooses to draw nothing when not in the legend. that's quite a hack though.
>> 
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