Due to a bug, introduced in January 2019, MA offsets are wrong (smaller by a factor of 1000) for SXU undulators
 SN 18, 19,20,and SN01; DS05. It was decided to leave data as is because it will result in an acceptabe 
K error ~ 1*10-4 (away from axis measurement).
Due to a bug in naming the zscan files, "x+" in file names means going into the gap (bench coordinate system). 
It is opposite to the right hand coordinate system. Fixed on 10/5/2020.
The "x+ or x-" in the file names means now a shift in x in the right hand coordinate system.