Convergence search of partial cross sections with respect to the maximum internuclear distance, R₂, for radial continuum wave functions is illustrated at 0.1 eV to 0.2 eV for J_i = 80, at 0.5 eV to 0.6 eV for J_i = 130, and at 0.7 eV to 0.8 eV for J_i = 160 with the energy spacing dE_i = 10⁻⁴ eV. From the bottom to the top panel, the collision energies increase. Different maximum internuclear distances were used for the radial continuum wave functions. The red line represents a non-converged partial cross section. The black line represents the converged partial cross section. The dashed green line shows that the convergences were achieved at the black line. The black line is on top of the red line, where they coincide, and the dashed green line is on top of the black line. A logarithmic scale is used on the y-axis.