# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.305821        0.00295300    
     0.460000          0.700000          0.313214        0.00278098    
     0.700000           1.00000          0.308232        0.00326138    
      1.00000           1.54000          0.288576        0.00342028    
      1.54000           2.40000          0.250662        0.00383423    
      2.40000           4.80000          0.204660        0.00483959    
      4.80000           10.0000          0.157097        0.00659571