# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0370989         0.0102815    
     0.460000           1.00000         0.0275816        0.00721495    
      1.00000           1.54000        0.00991440         0.0134880    
      1.54000           2.40000         0.0988678         0.0173076    
      2.40000           4.80000         0.0591733         0.0141866    
      4.80000           10.0000         0.0518641         0.0147726