Constraints on lensing amplitude A_lens and the IA amplitude A_IA, with three different methods: assuming there is no IA in the measured w^κγ (blue), considering the impact of IA with conventional IA model but do not use SC (orange), and using SC to subtract IA information and constrain together with the CMB lensing cross-correlation (green). When IA is ignored, A_IA is unconstrained. The similar height and width of A_lens PDFs between blue and green prove that by including SC, the A_IA − A_lens degeneracy can be efficiently broken so that the constraining power loss in A_lens is very small.