OXCE branch oxce-plus vs branch master

[Skybuck]

OpenXcom fork/repository:

https://github.com/MeridianOXC/OpenXcom

What is the difference between branch oxce-plus and branch master in this github fork/repository ?

Which branch should I use for experimental purposes/development and trying to include physically based rendering ?

For now my guest would be the "default" branch ocxe-plus.

But why does there still exist a "master" branch ? Is this a left over ? Also it was updated 24 days ago ? So why is master still being updated

[Meridian]

branch master = OXC
branch oxce-plus = OXCE

master branch still exists, because I like to have it around (e.g. for comparison, history digging, pull requests, etc.), instead of having to check out a different repository
it's updated to keep it in synch with OXC repo