# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.405568         0.0102183    
     0.460000          0.700000          0.435912        0.00839780    
     0.700000           1.00000          0.527605         0.0155144    
      1.00000           1.54000          0.563664         0.0312172    
      1.54000           2.40000          0.702473         0.0677393    
      2.40000           4.80000          0.651784         0.0719100    
      4.80000           10.0000          0.552627          0.125005