How about this one?
http://hydlaa.com/smf/index.php?topic=21677.msg237986#msg237986"
21. What do the yellow, green, red, and blue bars near the skills mean?
Yellow -- Amount of theoretical knowledge (training) needed before you start the practical part (working with that skill).
Green -- Amount of theoretical knoledge achieved (when training) or amount of practical experience (when practicing)
Red -- Amount of practical experience required up to next level
Blue -- Your curent progression points. (If the blue bar is longer than the yellow bar, you can complete the theoretical training for the skill in question.)
"