            energy_bins:   32 x 2 array like [[e_bin_0_low, ebin_0_up], ...[]]
            Returns
            --------
            transmission for the energy bins
            
        &#39;&#39;&#39;
        base_comps = [
            self.components[name] for name in [
                &#39;front_window&#39;, &#39;rear_window&#39;, &#39;dem&#39;, &#39;mli&#39;,
                &#39;calibration_foil&#39;, &#39;dead_layer&#39;
            ]
        ]

        if attenuator:
            base_comps.append(sel