# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.105851        0.00447295    
     0.460000          0.700000          0.115324        0.00355870    
     0.700000           1.00000          0.122655        0.00532275    
      1.00000           1.54000          0.118203        0.00425152    
      1.54000           2.40000          0.114410        0.00445840    
      2.40000           4.80000         0.0911200        0.00571144    
      4.80000           10.0000         0.0967401        0.00791333