# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0732841        0.00282100    
     0.460000          0.700000         0.0699800        0.00263434    
     0.700000           1.00000         0.0603052        0.00279954    
      1.00000           1.54000         0.0637209        0.00265271    
      1.54000           2.40000         0.0650398        0.00335409    
      2.40000           4.80000         0.0491207        0.00411291    
      4.80000           10.0000         0.0305257        0.00542641