# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0551200        0.00219711    
     0.460000          0.700000         0.0527685        0.00197979    
     0.700000           1.00000         0.0521303        0.00209619    
      1.00000           1.54000         0.0502230        0.00219983    
      1.54000           2.40000         0.0536901        0.00256272    
      2.40000           4.80000         0.0592943        0.00326754    
      4.80000           10.0000         0.0602190        0.00443360