Check our intuition about the illumination of the fibers at LAM

Our two assumptions that we use when analyzing the LAM data are:

1. Changing the attenuator value does not change the illumination of the pupil. This makes sense given that attenuator is positioned before the illuminating sphere, which should fix any potential problems here. LAM took some defocused data with very different attenuator values (att_value=0 and att_value=220) so that this hypothesis could be tested. If needed we will ask for more data (perhaps even higher att_value).

2. Changing the exposure time changes the illumination of the pupil, due to shutter movement. LAM took some data for us with exp_time=15,12,9,6,3 and 1 second where we can test if we see this difference.