1 1.5 2 2.5 3  [fm$^{-1}$] -0.5 0 0.5 1 1.5 2 E [MeV] E$_{0}$=-0.397743 MeV E$_{1}$ E$_{2}$ E$_{3}$ M=40 FIG. 1: (Color on line) The two-nucleon bound state energy E$_{0}$ and the first three positive eigen- values E$_{j}$ as a function of β in the case of M = 40 28