# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0353929        0.00486085    
     0.460000          0.700000         0.0512467        0.00443448    
     0.700000           1.00000         0.0430185        0.00706080    
      1.00000           1.54000         0.0486823        0.00779103    
      1.54000           2.40000         0.0306359         0.0152232    
      2.40000           4.80000         0.0750154         0.0149557    
      4.80000           10.0000         0.0801897         0.0283880