 The study of photoelectron spectroscopy at 80000EV and 7-8.4EV revealed that the 4F lattice coherence and intrinsic gap are robust in strongly correlated alloys SM-1-XEU-XB-6 and YB-1-XLU-XB-12 but collapsed by Lu substitution at X equals 0.125 for YB-1-XLU-XB-12. The temperature dependence of the spectral shapes near the femilevel shows contrasting results between YB-12 and SMB-6 with the gap shape not changing below 15K for YB-12 but further increased below 15K for SMB-6. The possibility of surface contribution is discussed for SMB-6. This article was authored by J. Yamaguchi, Asekiyama, M. Waikimura and others. We are article.tv, links in the description below.