# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0456478        0.00155723    
     0.460000          0.700000         0.0489136        0.00156593    
     0.700000           1.00000         0.0561913        0.00181557    
      1.00000           1.54000         0.0650695        0.00193486    
      1.54000           2.40000         0.0741172        0.00268998    
      2.40000           4.80000         0.0829944        0.00370492    
      4.80000           10.0000         0.0645994        0.00619145