Author Institution: Physikalisch-Chemisches Institut, Justus-Liebig-Universit\""{a}tWe have measured and analyzed the emission spectrum of HNC from 400 to 4100cmβ1. The HNC was observed as an equilibrium mixture of HCN and HNC in a fused quartz cell heated to 1350 K. The three fundamental bands and many hot bands of HNC were measured with resolutions ranging from 0.006cmβ1 for the lowest fundamental to 0.033cmβ1 for the other two. Thirty-five different vibrational and vibrational angular momentum states were measured. High rotational levels, in some cases up to J=50, were also measured. Now all the quadratic contributions to the vibrational and rotational term values have been measured, as well as some higher order contributions