1. Within reason the flatness is not as important for the mini-strip since it is attached with either double-sided tape or rubber cement.
2. For correlation work you use standard holder and strips to develop the saturation curve. This may involve set-ups at various angles according to your drawing instructions. Once you have all of your saturation curves you can then expose the mini-strip to the blast stream in the same manner, i.e. same distance and angle, but you only need to expose the mini-strip for the T1 times of each saturation curve. The arc heights of the mini-strips thus give you indication of intensity in the difficult locations.
