Refining to near spectroscopic accuracy the double many-body expansion potential energy surface for ground-state NH2

► DMBE potential energy surface of NH2 refined to near spectroscopic accuracy. ► Nontrivial procedure: multiproperty fit of ab initio points and frequencies. ► Scheme includes Renner-Teller effect for total angular momentum N = 0. ► PES essentially unaltered: errors in ab initio energies corrected by direct fitting.