Roots of BESSJ0:

                  x           F(x)

 Root  1      2.404826     -0.4961E-07
 Root  2      5.520078      0.4911E-07
 Root  3      8.653728      0.6095E-07
 Root  4     11.791535      0.1439E-06
 Root  5     14.930918      0.5961E-07
 Root  6     18.071068      0.6612E-06
 Root  7     21.211637     -0.9485E-07
 Root  8     24.352474      0.3820E-06
 Root  9     27.493481     -0.1873E-06
 Root 10     30.634600     -0.1024E-05
 Root 11     33.775822     -0.4201E-06
 Root 12     36.917091     -0.7087E-06
 Root 13     40.058430     -0.6985E-06
 Root 14     43.199791      0.1006E-06
 Root 15     46.341183      0.4777E-06
 Root 16     49.482609      0.5500E-07