# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0486248        0.00338577    
     0.460000          0.700000         0.0505095        0.00271475    
     0.700000           1.00000         0.0573521        0.00292518    
      1.00000           1.54000         0.0559583        0.00209068    
      1.54000           2.40000         0.0504656        0.00245219    
      2.40000           4.80000         0.0477996        0.00282831    
      4.80000           10.0000         0.0374845        0.00399254