# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00396840       0.000579081    
      1.00000           2.00000        0.00820192       0.000458004    
      2.00000           10.0000        0.00550364       0.000372521