# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.238743        0.00303827    
     0.460000          0.700000          0.242285        0.00285942    
     0.700000           1.00000          0.249151        0.00335786    
      1.00000           1.54000          0.225137        0.00352710    
      1.54000           2.40000          0.200771        0.00397053    
      2.40000           4.80000          0.179110        0.00507119    
      4.80000           10.0000          0.138754        0.00722717