def METHOD_NAME(self):
    filename = os.path.join(self._path, "outputs", "scales.txt")
    read_type = np.dtype([('snap_number', np.int32), ('scale', np.float32)])
    self.scale_to_snap = np.loadtxt(filename, dtype=read_type)
    self._snap_min = self.scale_to_snap['snap_number'].min()
    self._snap_max = self.scale_to_snap['snap_number'].max()