Quote: 

arbcav 
a la mode 
measurement 
g tangential 
0.9754 
0.9753 
0.986 +/ 0.001 
g sagital 
0.9686 
0.9685 
0.968 +/ 0.001 

Given that we're measuring different g parameters in the tangential and sagittal planes, I went back to alamode to see what astigmatism I could put into PR2 and/or PR3 to match what we're measuring. I looked at three cases: only PR2 is astigmatic, only PR3 is, or where we split the difference. Since the sagittal measurement matches, I left all the sagittal curvatures the same in
case 1: PR3 only

PR2 RoC (m) 
PR3 RoC (m) 
g (half PRC) 
tangential 
706 
420 
0.986 
sagittal 
706 
700 
0.969 
case 2: PR3 only

PR2 RoC (m) 
PR3 RoC (m) 
g (half PRC) 
tangential 
5000 
700 
0.986 
sagittal 
706 
700 
0.969 
case 3: PR2 and PR3

PR2 RoC (m) 
PR3 RoC (m) 
g parameter 
tangential 
2000 
600 
0.986 
sagittal 
706 
700 
0.969 
From Koji's post about the scans of the G&H mirrors, it looks entirely reasonable that we could have these levels of astigmatism in the optics.
What this means for full PRC
These all make the same full PRC situation:
g (tangential): 0.966
g (sagittal): 0.939
ARM mode matching: 0.988
