# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0262282        0.00525782    
     0.460000           1.00000         0.0162260        0.00414507    
      1.00000           1.54000         0.0212122        0.00531375    
      1.54000           2.40000         0.0208118        0.00712502    
      2.40000           4.80000         0.0309340        0.00789943    
      4.80000           10.0000         0.0403821         0.0101637