The MLR potential has successfully summarized all experimental spectroscopic data (and/or virial data) for a number of diatomic molecules, including: N 2, Ca 2, KLi, MgH, several electronic states of Li 2, Cs 2, Sr 2, ArXe, LiCa, LiNa, Br 2, Mg 2, HF, HCl, HBr, HI, MgD, Be 2, BeH, and NaH. More sophisticated versions are used for polyatomic molecules.