Filename: test_matrix.mcool
Contains 20 single-cell matrices
The information stored via cooler.info of the first cell is: 

bin-size 1000000
bin-type fixed
creation-date 2019-05-16T11:46:31.826214
format HDF5::Cooler
format-url https://github.com/mirnylab/cooler
format-version 3
generated-by cooler-0.8.3
genome-assembly unknown
metadata {}
nbins 2744
nchroms 35
nnz 55498
storage-mode symmetric-upper
sum 486056
