# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.252361        0.00635207    
     0.460000          0.700000          0.273222        0.00658771    
     0.700000           1.00000          0.343880        0.00924058    
      1.00000           1.54000          0.491193         0.0180751    
      1.54000           2.40000          0.526030         0.0219513    
      2.40000           4.80000          0.341924         0.0350058    
      4.80000           10.0000          0.258746         0.0990450