Capture rates in the case where the planetesimal disk has a gap with half width W _gap (ζ = 3 × 10 ⁻⁷,  ). Dashed and dotted lines show capture rates for the prograde and retrograde cases, respectively. Crosses, circles, triangles, squares, and inverted triangles show the results for W _gap = 0, 1, 2, 3, and 4, respectively.