# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0158646        0.00295815    
     0.460000          0.700000         0.0243711        0.00227830    
     0.700000           1.00000         0.0218359        0.00384142    
      1.00000           1.54000         0.0311308        0.00284011    
      1.54000           2.40000         0.0206081        0.00369307    
      2.40000           4.80000         0.0265517        0.00355098    
      4.80000           10.0000         0.0261881        0.00538074