0 1 2 3 4 5 6 0.0 0.1 0.2 0.3 0.4 0.5 0.6 1 2 3 4 5 6 - 0.4 - 0.2 0.0 0.2 0.4 0.6 0.8 29 FIG. 4: The normalized 2 s excited state radial wave functions ψ$_{a}$ ( x ) (solid curve) and − ψ$_{b}$ ( x ) (dashed curve) for massless quarks in the GMSS linear potential for fitting q ¯ q mesons. FIG. 3: The normalized 1 s ground state radial wave functions ψ$_{a}$ ( x ) (solid curve) and − ψ$_{b}$ ( x ) (dashed curve) for massless quarks in the GMSS linear potential for fitting q ¯ q mesons.