# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00910523         0.0146184    
     0.460000          0.700000         0.0246799        0.00897301    
     0.700000           1.00000         0.0274831         0.0125833    
      1.00000           2.40000         0.0221857        0.00719304    
      2.40000           4.80000         0.0315665         0.0179282    
      4.80000           10.0000         0.0587522         0.0208954