Roots of BESSJ0:

                  x           F(x)

 Root  1      2.404827     -0.5643E-06
 Root  2      5.520077     -0.4800E-06
 Root  3      8.653729     -0.4569E-06
 Root  4     11.791533     -0.2997E-06
 Root  5     14.930930     -0.2501E-05
 Root  6     18.071054     -0.1845E-05
 Root  7     21.211639     -0.4253E-06
 Root  8     24.352465     -0.1160E-05
 Root  9     27.493486     -0.1058E-05
 Root 10     30.634581     -0.3774E-05
 Root 11     33.775833     -0.1991E-05
 Root 12     36.917088     -0.1210E-05
 Root 13     40.058434     -0.1179E-05
 Root 14     43.199783     -0.8256E-06
 Root 15     46.341213     -0.3099E-05
 Root 16     49.482594     -0.1676E-05