# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0651212         0.0335960    
     0.460000          0.700000         0.0908099         0.0177858    
     0.700000           1.00000          0.139113        0.00800197    
      1.00000           1.54000          0.140048        0.00379261    
      1.54000           2.40000          0.155703        0.00332151    
      2.40000           4.80000          0.148763        0.00340171    
      4.80000           10.0000          0.121671        0.00444359