# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0604029         0.0112605    
     0.460000          0.700000         0.0715996         0.0117723    
     0.700000           1.00000         0.0826480         0.0164236    
      1.00000           1.54000          0.119613         0.0201199    
      1.54000           2.40000          0.213075         0.0252278    
      2.40000           10.0000          0.114974         0.0490264