Roots of bessj0: x f(x) root 1 2.404827 -0.000001 root 2 5.520077 0.000000 root 3 8.653729 0.000000 root 4 11.791534 0.000000 root 5 14.930918 0.000000 root 6 18.071066 0.000000 root 7 21.211636 0.000000 root 8 24.352472 0.000000 root 9 27.493477 0.000000 root 10 30.634607 0.000000 root 11 33.775822 0.000000 root 12 36.917095 0.000000 root 13 40.058426 0.000000 root 14 43.199787 -0.000001 root 15 46.341187 0.000000 root 16 49.482613 0.000000