How does skill experience work?

[milski]

So, skills take more experience to level up at higher levels; this is shown with a cyan number on the training screen. But skills also seem to take more experience to level up based on your total level, and I've never figured out exactly how that worked. Is there some sort of factor that just drops how much skill experience you earn as you level up?

[VeryAngryFelid]

http://crawl.chaosforge.org/Skill_point
http://crawl.chaosforge.org/Xp

[stickyfingers]

http://git.develz.org/?p=crawl.git;a=bl ... =HEAD#l839