Averaged fractions of l-dependent capture for N^{7 +} and O^{7 +}, plotted as a function of l. Black solid lines are the data from theoretical calculations, and the red, blue, magenta, and orange dashed lines are empirical functions shown in Eqs. (4)–(6), (8), respectively. Panels a) and b) are the capture for n = 4 at v = 200 km s^-1 and 2000 km s^-1, respectively, and c) and d) are those for n = 5.