Leginon

Use the gui "use frames" to define the pattern of the 7 frame bins.

For example,

(1,17) means to start from frame number 1 (default, since frame 0 is rolling-in), and end at frame 14. As Equally as possible to distribute the frames in the 7 available bins with left over at later frames. This gives [2,2,2,2,3,3,3] frames in the bins.

(1,3,16) means forcing bin 1 to bin 2 (= 3 - 1) to have single frame and distribute the rest. This gives [1,1,2,3,3,3,3]

If left empty, all frames within the exposure time will be saved and equally distributed.