# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0452258         0.0268685    
      1.00000           1.54000         0.0559084         0.0170121    
      1.54000           2.40000         0.0183135        0.00989987    
      2.40000           4.80000         0.0194773        0.00643299    
      4.80000           10.0000         0.0226010        0.00810760