Chris and I were looking at the TF from ISI to OPLEV tonight and as part of that we imrpoved the diagnolization of the OPLEV, the axis was about 3 degrees off
The old matrix was +/-1s the new one is
-0.9565 0.9565 -1.0417 1.0417
1.0417 -1.0417 -0.9565 0.9565 (shown in figure)
we got about a factor of 10 improvement (blue vs orange line)
there is room for further improvement if needed