# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0881962        0.00278098    
     0.460000          0.700000         0.0933953        0.00256271    
     0.700000           1.00000          0.104346        0.00299125    
      1.00000           1.54000          0.116023        0.00351113    
      1.54000           2.40000          0.129292        0.00519697    
      2.40000           4.80000          0.132686        0.00720555    
      4.80000           10.0000          0.128176         0.0118794