bracketing values:        function values:
    x1         x2            bessj0(x1)   bessj0(x2)
   1.00       3.60            0.765198    -0.391769 
   2.00       3.00            0.223891    -0.260052 
   1.40       4.00            0.566855    -0.397150 
   4.00       6.60           -0.397150     0.274043 
   5.00       6.00           -0.177597     0.150645 
   4.40       7.00           -0.342257     0.300079 
   7.00       9.60            0.300079    -0.208979 
   8.00       9.00            0.171651    -0.090334 
   7.40      10.00            0.278596    -0.245936 
  10.00      12.60           -0.245936     0.162607