# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00560563        0.00807705    
      1.00000           1.54000         0.0453407        0.00560884    
      1.54000           2.40000         0.0444575        0.00429954    
      2.40000           4.80000         0.0371813        0.00369676    
      4.80000           10.0000         0.0301101        0.00423955