# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0367634         0.0171608    
     0.460000           1.54000        0.00961633        0.00896199    
      1.54000           2.40000          0.126736         0.0125013    
      2.40000           4.80000          0.208431        0.00611170    
      4.80000           10.0000          0.135666        0.00557799