raw data taken in K2 super resolution mode
426 multi-frame stacks before gain correction, motion correction and distortion correction
TIFF format with LZW compression
7676*7420 
Pixel type: 8 bit
pixel size 0.0435 nm 
gain file: gain.mrc (7676*7420, 32bit)
no flip and no rotation
distortion parameter: distotaion angle:26.1; major scale:1.019; minor scale:1
total dose: 60 e/A2