# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.196681        0.00393029    
     0.460000          0.700000          0.194972        0.00397149    
     0.700000           1.00000          0.201437        0.00482918    
      1.00000           1.54000          0.192376        0.00637067    
      1.54000           2.40000          0.202875        0.00867391    
      2.40000           4.80000          0.204976         0.0133618    
      4.80000           10.0000          0.132602         0.0229447