Roots of BESSJ0:

                  x           F(x)

 Root  1      2.404827     -0.5643E-06
 Root  2      5.520077     -0.4800E-06
 Root  3      8.653728     -0.1980E-06
 Root  4     11.791534     -0.7776E-07
 Root  5     14.930918      0.5961E-07
 Root  6     18.071066      0.3032E-06
 Root  7     21.211636      0.2357E-06
 Root  8     24.352472      0.7356E-07
 Root  9     27.493477      0.3932E-06
 Root 10     30.634607      0.7590E-07
 Root 11     33.775818      0.1037E-06
 Root 12     36.917095     -0.2078E-06
 Root 13     40.058426     -0.2176E-06
 Root 14     43.199783     -0.8256E-06
 Root 15     46.341187      0.3058E-07
 Root 16     49.482605     -0.3777E-06