# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0621543        0.00525232    
     0.460000          0.700000         0.0693373        0.00592838    
     0.700000           1.00000         0.0712117        0.00731626    
      1.00000           1.54000         0.0778574        0.00846884    
      1.54000           2.40000         0.0705067         0.0129229    
      2.40000           4.80000         0.0114474         0.0177183    
      4.80000           10.0000         0.0716540         0.0255123