# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0123532        0.00397065    
     0.460000          0.700000         0.0119163        0.00351237    
     0.700000           1.00000         0.0273295        0.00287624    
      1.00000           1.54000         0.0228892        0.00303291    
      1.54000           2.40000         0.0200267        0.00409488    
      2.40000           4.80000         0.0192884        0.00477246    
      4.80000           10.0000         0.0228324        0.00605696