Our conclusion is that the higher energy setup has a much greater ultimate sensitivity to θ ( 4fam ) 13 than the ISS - inspired 20 GeV one . On the other hand , both setups are not able to improve the present bounds on θ 14 when marginalizing over θ 24 , θ 34 ( see , however , Sec . 4.3 ) . The silver channel can significantly improve the θ ( 4fam ) 13 -sensitivity when only one baseline is considered at the 50 GeV setup . However , it has a negligible impact when the combination of the golden channel data at the two baselines is considered .