# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0205997        0.00649241    
     0.700000           1.00000         0.0186366        0.00693735    
      1.00000           1.54000         0.0199293        0.00431461    
      1.54000           2.40000         0.0101191        0.00606019    
      2.40000           4.80000         0.0108386        0.00661664    
      4.80000           10.0000         0.0285724        0.00634681