# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0970344        0.00205685    
     0.460000          0.700000          0.106008        0.00179758    
     0.700000           1.00000          0.111673        0.00227271    
      1.00000           1.54000          0.115118        0.00212837    
      1.54000           2.40000          0.119948        0.00235395    
      2.40000           4.80000          0.115741        0.00272943    
      4.80000           10.0000         0.0953023        0.00417707