# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0929027        0.00456704    
     0.460000          0.700000         0.0835931        0.00453944    
     0.700000           1.00000         0.0826090        0.00534723    
      1.00000           1.54000         0.0807220        0.00593949    
      1.54000           2.40000         0.0833487        0.00746652    
      2.40000           4.80000         0.0488557         0.0105166    
      4.80000           10.0000         0.0555045         0.0159232