Problem(s) Encountered:

No major issues, however for multiple masks the dispersed light through the slits

(comp, flat, and science images) all showed a slight bending toward the edges of the

field. Now that I notice this, I also see much slighter versions of this deformity in

the data taken on previous nights.

Solutions:

It’s been determined that installing masks into their holders has to be done with a gentle hand.  Over-tightening retention clips can easily deform the masks curvature.  A properly seating mask should show a uniform concavity in orientation.