# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0460153        0.00325984    
     0.460000          0.700000         0.0421426        0.00377801    
     0.700000           1.00000         0.0519311        0.00469884    
      1.00000           1.54000         0.0602134        0.00447455    
      1.54000           2.40000         0.0463795        0.00733384    
      2.40000           4.80000         0.0417272         0.0109011    
      4.80000           10.0000         0.0968041         0.0141989