We've had to learn to combat the roughness of the aerogel surface to get movies in focus. We introduced a quality check during data processing at Berkeley to highlight whole tiles that needed to be rescanned. Out of those 14 tiles we've rescanned 2 with another 4 needing to be redone.
Here are the results of 7 more tile quality checks. As before, the more green points, the more in-focus movies. We're doing better than before, now more tiles have more good movies.
We can't eradicate bad focus movies altogether, but we are striving to keep them to a minimum.
key: red = focus too high; blue = too low; black = no focus; white = no data; green = good.