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

Compare vibrational frequencies in CCCBDB for C3 (carbon trimer)

B3PW91/6-31G(2df,p)

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 1240 16 Σg 1225  
2 Σu 2072 32 Σu 2040  
3 B2 2048 1985 Πu 63  
The calculated vibrational frequencies were scaled by 0.9614

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.