(a) Range of that leads to collision or capture orbits for on the – plane, where . The thin solid lines represent the range of for collision orbits, while the dots on these lines show the values of where at least one captured orbit was found. The contour lines of the initial values of E (calculated from Equations (5) and (6) with ) are also shown, with an interval of 1 for 0 ⩽ E ⩽ 10 and 5 for E ⩾ 10. (b) Plots of E for collision and capture orbits as a function of .