I am running anharmonic frequency calculation in gaussian 16. In the output file, I got the frequencies along with their normal modes in a section named Vibrational Energies at Anharmonic Level. But the numbering of normal modes is opposite that of numbering of modes in harmonic frequencies. To be more specific, the first mode in anharmonic is the last mode in harmonic frequency, and so on. I want to get the order of the modes in anharmonic calculation as I got in the harmonic calculation. Would any one of you have some time to help me in this regard? Thank you for reading.

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