# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0538436        0.00270624    
     0.460000          0.700000         0.0507410        0.00229140    
     0.700000           1.00000         0.0496826        0.00257072    
      1.00000           1.54000         0.0399834        0.00252436    
      1.54000           2.40000         0.0262371        0.00388493    
      2.40000           4.80000         0.0220117        0.00567843    
      4.80000           10.0000         0.0140926         0.0107625