# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0457094        0.00444577    
     0.460000          0.700000         0.0490413        0.00281115    
     0.700000           1.00000         0.0524322        0.00264609    
      1.00000           1.54000         0.0547221        0.00227803    
      1.54000           2.40000         0.0519126        0.00305411    
      2.40000           4.80000         0.0515610        0.00313615    
      4.80000           10.0000         0.0416263        0.00412812