# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.145588        0.00477711    
     0.460000          0.700000          0.162219        0.00440439    
     0.700000           1.00000          0.188185        0.00553686    
      1.00000           1.54000          0.284583        0.00748002    
      1.54000           2.40000          0.335774         0.0122532    
      2.40000           4.80000          0.403554         0.0190905    
      4.80000           10.0000          0.437343         0.0429531