# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00647099        0.00146167    
      1.00000           2.00000        0.00995047        0.00207707    
      2.00000           10.0000         0.0100008        0.00301138