Table 2: Numbering convention used for the molecular orbitals.
Number Orbital   Number Orbital
1 $1s_{\rm N}$   8 \ensuremath {\sigma _{{\rm NH}}^*}
2 $1s_{\rm C}$   9 \ensuremath {\sigma _{{\rm CH}}^*}
3 \ensuremath{\sigma_{{\rm CN}}}   10 \ensuremath{\sigma_{\rm Ryd}}
4 $\ensuremath{\pi_{{\rm CN}}} (x)$   11 \ensuremath{\sigma_{\rm Ryd}}
5 $\ensuremath{\pi_{{\rm CN}}} (y)$   12 $\ensuremath{\pi_{{\rm CN}}^*} (x)$
6 \ensuremath{\sigma_{{\rm CH}}}   13 $\ensuremath{\pi_{{\rm CN}}^*} (y)$
7 \ensuremath{\sigma_{{\rm NH}}}      


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