wˌɛɹ ɹˌɛpɹᵻzˈɛnts ðə "sˈɛlfˈɛnɚdʒi" əvə pɚtˈɪkjʊlɚ ɹˈoʊɾeɪmɚ , ænd ɹˌɛpɹᵻzˈɛnts ðə "pˈɛɹ ˈɛnɚdʒi" ʌvðə ɹˈoʊɾeɪmɚz .
Where  represents the "self-energy" of a particular rotamer , and  represents the "pair energy" of the rotamers .