# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0714208         0.0115899    
     0.460000          0.700000         0.0849440        0.00841959    
     0.700000           1.00000         0.0677527        0.00714471    
      1.00000           1.54000         0.0507568        0.00862982    
      1.54000           2.40000         0.0720365        0.00903483    
      2.40000           4.80000         0.0476671         0.0156335    
      4.80000           10.0000         0.0416426         0.0266736