However, when including two-body contributions in the db-MFCC-MBE(2) scheme, the errors per amino acid are reduced to below 1.5 kJ/mol. In most cases, this amounts to a reduction of the error by roughly a factor of two, but in cases such as 1CTF, where the error of the eb-MFCC-MBE(2) was particularly large, even larger reductions are observed.