# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.190661        0.00763426    
     0.460000          0.700000          0.171777        0.00535876    
     0.700000           1.00000          0.163436        0.00584353    
      1.00000           1.54000          0.132544        0.00507518    
      1.54000           2.40000          0.133579        0.00646916    
      2.40000           4.80000         0.0840647        0.00761361    
      4.80000           10.0000         0.0669570         0.0113815