Finally, we considered the M06-HF functional that includes 100% exact exchange and has been advertised as a density functional for spectroscopy, with better groundstate properties than B3LYP. 148 While that statement is statistically true for the data sets considered in Ref. 148, we find that M06-HF is significantly inferior to B3LYP (and to BH&H-LYP) for the much more extensive data sets that are examined here. M06-HF data can be found in Table , which should be compared with the corresponding B3LYP data in Table . The M06-HF functional will not be discussed any further.