# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00990263        0.00174525    
      1.00000           2.00000        0.00517045        0.00472489    
      2.00000           10.0000         0.0120071        0.00452204