Many measurements were made with the full gap encoders.  They were unreliable and caused large taper errors.
Finally, we switched to using the half gap encoders.  The measurements became repeatable.  This started
at Final Results_ABC_test_B_rep2.  Test B rep 2 to 5 are repeatable measurements of the undulator in positon B
using the half gap encoders.

Final Results_ABC_test_A had the probe at the wrong x-position because it was stuck on a limit switch.
Final Results_ABC_test_A_rep1 agrees with Final Results_ABC_test_B_rep5.
ZW
12/18/18

Final Results_ABC_test_C does not agree with the results from the position A or B measurements.
After the position C measurements, a lifetime test was performed.
\Tuning\Run 95 was a repeat measurement after the lifetime test.  It did not repeat the C position measurements.
ZW
1/7/19