Example of the structure of one of the 72 1000-image data files
HDF5 "/EIGER_x1_insu_800Hz/x1_insu_0p00125d_0p00125s_0p01beam_data_000001.h5" {
GROUP "/" {
GROUP "entry"
@"NX_class" : "NXEntry"
DATASET "data" [1000:..., 1065, 1030]{ }
@"NX_class" : "NXdata"
@"image_nr_high" : 1000
@"image_nr_low" : 1