# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0623833        0.00448895    
     0.460000          0.700000         0.0825355        0.00562771    
     0.700000           1.00000          0.111602        0.00869710    
      1.00000           1.54000          0.151206         0.0130553    
      1.54000           2.40000          0.201404         0.0199024    
      2.40000           4.80000         0.0922566         0.0481902    
      4.80000           10.0000          0.249985         0.0528910