# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00488466        0.00507777    
      1.00000           2.00000        0.00748563        0.00538589    
      2.00000           10.0000         0.0178226        0.00574409