For all the other training set members, there is no new evidence which would cause a revision of the originally proposed fundamental wavenumbers, with or without deperturbation, although the DBN case is currently under reinvestigation. Hence, the following training set wavenumber alternatives remain, depending on whether raw results for the strongest signal or deperturbation for the high order anharmonic resonance is attempted. For ACE, the raw/deperturbed alternatives are 3538/3531 cm -1 , for APH 3536/3530 cm -1 , for DBN 3484/3487 cm -1 . Note that Fig. only lists the raw values. The methods shown in Fig. would profit by at most 10% in their RMSD when switching to deperturbed reference values. Other deficiencies of the models clearly dominate. Still, it is rewarding to see that none of the discussed methods deteriorate with the deperturbation. On the other hand, none of the submissions has attempted to model the highorder resonance explicitly. Therefore, this subtle anharmonic aspect is left for future iterations of HyDRA, with better performing theoretical methods.