# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0112726        0.00316377    
      1.00000           2.00000        0.00790280        0.00474721    
      2.00000           10.0000        0.00921601        0.00627136