Let me gum up the works a bit.
First, let me remind SWCA members that the data that Roy Jinks shares with us is PRIVILEGED, and is NOT to be broadly disseminated without prior permission.
I asked Roy for permission, and it was granted.
SWCA members can verify that here-
Pearl Grip Question- Your Permission Sought
See the post below that Roy Jinks made on the old SWCA Yahoo forum in 2006.