code: def _read_mz(self, mz_offset, mz_len, mz_enc_len):
          '''reads a mz array from the currently open ibd file'''
          self.ibd.seek(mz_offset)
          data = self.ibd.read(mz_enc_len)
          self.ibd.seek(0, 2)
          data = self.mz_compression.decompress(data)
          return tuple(np.fromstring(data, dtype=self.mz_dtype)f _read_mz(self, mz_offset, mz_len, mz_enc_len):
          '''reads a mz array from the currently open ibd file'''
          self.ibd.seek(mz_offset)
          data = self.ibd.read(mz_enc_len)
          self.ibd.seek(0, 2)
          data = self.mz_compression.decompress(data)
          return tuple(np.fromstring(data, dtype=self.mz_dtype))
docs: reads a mz array from the currently open ibd file