# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0295234         0.0352478    
     0.460000           1.54000         0.0247060        0.00811856    
      1.54000           2.40000         0.0512227        0.00424125    
      2.40000           4.80000         0.0576724        0.00370570    
      4.80000           10.0000         0.0559813        0.00415088