# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00397145        0.00184333    
      1.00000           1.54000        0.00305727        0.00551045    
      1.54000           2.40000         0.0120159        0.00380021    
      2.40000           4.80000        0.00674309        0.00735105    
      4.80000           10.0000         0.0179798        0.00771224