# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0278433        0.00348255    
      1.00000           2.00000         0.0232085        0.00394667    
      2.00000           10.0000         0.0195143        0.00487265