code: def _read_data(self, fp_, header):
          
          nlines = int(header["block2"]['number_of_lines'][0])
          ncols = int(header["block2"]['number_of_columns'][0])
          return da.from_array(np.memmap(self.filename, offset=fp_.tell(),
                                         dtype='<u2', shape=(nlines, ncols), mode='r'),
                               chunks=CHUNK_SIZE)
docs: Read data block