[Therion] changing wall line symbol

[Martin Sluka]

> 26. 5. 2019 v 9:56, Tarquin Wilton-Jones via Therion <therion at speleo.sk>:
> 
> It may be possible to do this with CSS and SVG too. Export your cave
> survey as SVG, and use CSS box-shadow to add an outline.

You may do it directly in Metapost.

Martin
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