Comment sem4160 SNF 2008-08-07 17:37:22: the gun aperture image is vignetted and I cannot figure out why.

[James Conway]

This item has been resolved I opened the Beam Monitor aperture strip to 
a larger hole.
Possibly mechanical alignment is necessary to eliminate what could be 
consider tilt in the axial alignment of the gun to the column axis.

jwc at snf.stanford.edu wrote:
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