# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000        0.00977751        0.00981670    
     0.700000           1.00000         0.0221872         0.0134815    
      1.00000           1.54000         0.0354201        0.00641196    
      1.54000           2.40000         0.0444308        0.00484185    
      2.40000           4.80000         0.0443409        0.00439506    
      4.80000           10.0000         0.0240139        0.00440799