# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0360556        0.00118774    
     0.460000          0.700000         0.0325028        0.00118611    
     0.700000           1.00000         0.0277785        0.00147022    
      1.00000           1.54000         0.0318586        0.00200913    
      1.54000           2.40000         0.0477400        0.00206957    
      2.40000           10.0000         0.0112382        0.00249682