Parameters needed
Need to enter:
Checkbox whether to do it at all or not.¶

Slit Width: Suggest to use 15 eV, since calibration was performed at that width. Generally we collect at 20 eV, but there is no problem to switch to 15 eV for the measurement

Exposure time: Default is 500 ms, which gives enough signal for the method to work. Can experiment with faster times if desired.

Mean free path: We measured mean free path to be 395 nm at NYSBC at 300 kV. It should depend only on the voltage.

Collect every N images: Since it adds overhead, you may want to do it only every 5 or 10 images.