the effect of the spin-orbit coupling is stronger at the $\Gamma$ than at the X point [@s3mazin], and should cause a larger gap between the [$d_{xz}$/$d_{yz}$]{} hole bands at $\Gamma$, which is not observed. The second mechanism is in-plane symmetry breaking, which causes anisotropic shift of the [$d_{xz}$/$d_{yz}$]{} bands and hence lift the degeneracy of these two orbitals, as has been observed in the orthorhombic state of [BaFe$_2$As$_2$]{} [@s4Yi11]. Up to date, there has not yet been any report of in-plane symmetry breaking in the AFS superconductors. In addition, one should note that the orthorhombicity causes the existence of natural twinning in the crystals. Hence in an unstressed crystal, the ARPES signal is a combination of dispersions from both types of domains, and would see bands from $\Gamma$-X and $\Gamma$-Y directions simultaneously, as was observed in [BaFe$_2$As$_2$]{} [@s4Yi11]. For the microscopically phase separated AFS superconductors, such twinning effect should be even more noticeable than [BaFe$_2$As$_2$]{}, but is not observed in the dispersions of AFS superconductors.

Another factor that should be considered is the comparison between $\Gamma$ and X. The flat [$d_{xy}$]{} hole band observed at $\Gamma$ is renormalized by a factor of $\sim$10 compared to bare LDA while the [$d_{xz}$/$d_{yz}$]{} 