# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0636239        0.00449063    
     0.460000          0.700000         0.0766753        0.00523030    
     0.700000           1.00000         0.0599797        0.00779935    
      1.00000           1.54000         0.0671403         0.0119778    
      1.54000           2.40000         0.0242870         0.0252404    
      2.40000           4.80000         0.0996708         0.0338123    
      4.80000           10.0000          0.145528         0.0695256