Available pseudopotentials:

Sn.pw91-n-van.UPF   (details)

	 Perdew-Wang 91 gradient-corrected functional
	 nonlinear core-correction
	 Vanderbilt ultrasoft

Sn.pz-bhs.UPF   (details)

	 Perdew-Zunger (LDA) exch-corr
	 Bachelet-Hamann-Schlueter and derived