[Therion] Setting scale on custom symbol

[Martin Budaj]

>
> There is a partial explanation of u: here
> https://therion.speleo.sk/wiki/metapost#symbol_sizing but I will admit to
> not knowing if it relates directly to U:  Are u: and U: the same? I suspect
> not.
>

Hi,
check also the chapter New map symbols / Point symbols in the Therion book
(page 73) for an explanation of "u" and "U" variables.
M.
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