0 1 2 3 4 0.0 0.5 1.0 1.5 2.0 FIG. 23: The normalized first excited 2 p 3 2 wave functions ψ$_{a}$ ( x ) and - ψ$_{b}$ ( x ) when V$_{s}$ ( x ) and V$_{v}$ ( x ) have equal asymptotic slopes. Compare this solution for the massless quark case ( u and d quarks) shown in Fig. 5. Compare also with the 2 p 3 2 hydrogen-atom wave functions, ψ$_{a,b}$ ( x ) in Figs. 15 and 16 (dashed curves). 39