# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00728409        0.00145459    
      1.00000           2.00000         0.0154680        0.00194444    
      2.00000           10.0000        0.00777599        0.00420483