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IV.C.1. (XIII.D.1.)

Compare vibrational frequencies in CCCBDB for C2N2 (Cyanogen)

PBEPBE/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 2318 -12 Σg 2330  
2 Σg 870 24 Σg 846  
3 Σu 2131 -27 Σu 2158  
4 Πg 781 278 Πg 503  
5 Πu 310 76 Πu 234  
The calculated vibrational frequencies were scaled by 0.9909

See section XIII.C.3 List or set vibrational scaling factors to change the scale factors used here.
See section III.B.3.c Calculate a vibrational scaling factor for a set of molecules to determine the least squares best scaling factor.
See section III.B.3.b List of vibrational scaling factors and their uncertainties for information on where the above scaling factor is from.