def METHOD_NAME(self, filename: Path) -> None:
    _log.info(f"Reading SLS file {filename}")
    with filename.open("r") as fh:
        for line in fh.readlines():
            name, _, polygon, lower, upper = line.split()
            self.elements_list.append(
                dict(
                    geometry=self.polygons[polygon],
                    designator=name,
                    upper=float(upper),
                    lower=float(lower),
                )
            )