# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00259921        0.00477903    
      1.00000           1.54000         0.0144279        0.00953173    
      1.54000           2.40000         0.0106280         0.0124109    
      2.40000           4.80000         0.0233920        0.00555240    
      4.80000           10.0000         0.0617756        0.00330645