Worked out how to do an underglow (should work with anything) …
… and, whilst I’m sure you’re all able to do this already, it was new to me, so felt like sharing … it ain’t pretty, but it’s pretty useful.
EDIT - OK, I’ve glow’d up the GTG Outpost stream (at the start / spring end near the outpost) that feeds the Grandeur Bath House outpost … will check back here come nightfall on Sochaltin I.