Problem about load_absorption_table in class EBL about agnpy HOT 2 OPEN

def load_absorption_table(self):
        """load the reference values from the table file to be interpolated later"""
        f = fits.open(self.model_file)
        self.energy_ref = (
            np.sqrt(f["ENERGIES"].data["ENERG_LO"] * f["ENERGIES"].data["ENERG_HI"])
            * u.keV
        )
        # Franceschini file has two columns repeated, eliminate them
        if self.model == "franceschini":
            self.z_ref = np.unique(f["SPECTRA"].data["PARAMVAL"])
            self.values_ref = np.unique(f["SPECTRA"].data["INTPSPEC"], axis=0)
        else:
            self.z_ref = f["SPECTRA"].data["PARAMVAL"]
            self.values_ref = f["SPECTRA"].data["INTPSPEC"]