# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00848179        0.00458567    
     0.460000          0.700000        0.00272202        0.00638371    
     0.700000           1.00000        0.00472237        0.00674176    
      1.00000           1.54000         0.0110140        0.00341346    
      1.54000           10.0000        0.00217755        0.00441757