# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0130034        0.00766518    
     0.700000           1.00000         0.0484558         0.0103714    
      1.00000           1.54000         0.0387502        0.00646704    
      1.54000           2.40000         0.0379163        0.00484042    
      2.40000           4.80000         0.0390684        0.00406281    
      4.80000           10.0000         0.0259622        0.00434503