# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0783606        0.00499159    
     0.460000          0.700000         0.0893061        0.00482340    
     0.700000           1.00000         0.0867909        0.00496723    
      1.00000           1.54000         0.0930099        0.00370023    
      1.54000           2.40000         0.0901186        0.00430769    
      2.40000           4.80000         0.0680643        0.00524368    
      4.80000           10.0000         0.0552151        0.00603848