# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0189913         0.0649361    
     0.460000           1.00000         0.0309338         0.0172993    
      1.00000           1.54000         0.0387474         0.0115228    
      1.54000           2.40000         0.0603313        0.00926430    
      2.40000           4.80000         0.0561143        0.00898485    
      4.80000           10.0000         0.0643541         0.0109408