Ping fitting experience
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It's not going to matter all that much if you're in between. A few years ago PING actually added color codes to fill in any gaps to the lie angle system. For example, Yellow is new, use to go Blue then Green as the lies got more upright. I'm pretty sure the difference between each color code now is .75 degrees, so pretty narrow gaps.
Edit: Yep found this http://thesandtrap.com/t/8775/new-ping-color-codes