seems to contradict the LDA prediction of the shallower electron band as [$d_{xz}$/$d_{yz}$]{} and the deeper one [$d_{xy}$]{} in FeSC [@28graser10] (Fig. \[fig:fig1\](i)), as observed in Co-doped [BaFe$_2$As$_2$]{} (Fig. \[fig:fig1\](f)-(g)). However, this assignment can be understood if we consider the KFS band structure as a whole. Three filled hole bands are observed near the $\Gamma$ point (Figs. \[fig:fig1\](d)-(e)), where the two lower ones can be identified as [$d_{xz}$/$d_{yz}$]{} and the higher one [$d_{xy}$]{}. Interestingly, the [$d_{xy}$]{} band is far more renormalized ($\sim$a factor of 10) compared to LDA than the [$d_{xz}$/$d_{yz}$]{} bands ($\sim$a factor of 3), indicating stronger correlation for the [$d_{xy}$]{} orbital. This is in contrast to the Co-doped [BaFe$_2$As$_2$]{} band structure, in which all orbitals are renormalized by roughly the same factor ($\sim$2) compared to LDA. Hence, our assignment of [$d_{xy}$]{} character to the shallower electron band is consistent with strong orbital-dependent renormalization, which brings the deeper [$d_{xy}$]{} electron band at X predicted by LDA to be shallower than the [$d_{xz}$/$d_{yz}$]{} band. This orbital-dependent renormalization behavior also emerges from our theoretical calculations as will be discussed later.

As the electronic structure at [$E_F$]{} is dominated by the large electron pockets at X, we focus on these features. Fig. 