I've looked at the difference between CAL asymmetry calibration made on the ground with cosmic muons and on orbit with using CNO.
Difference between ground calibration and on-orbit calibration made in August 2008 is show on the plot below separately for each of 10 segments along a crystal. Each histogram entry represents difference in asymmetry calibration constants for one crystal, converted to equivalent position bias in mm, using average asymmetry slope( 0.0022 per mm). 