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Beam phase-space measurements over a 12 s interval during normal operations for three dates: December 2013, March 2014 and August 2014. The top line is the zero referenced electron beam position, y, the bottom line is the vertical displacement due to angle, Dy′, and the middle line is the sum of the two, y + Dy′. Note the improvement in beam stability over the nine-month period. The standard deviation values are shown above each period.
