# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0136757        0.00145758    
     0.460000          0.700000         0.0132902        0.00140914    
     0.700000           1.00000         0.0127472        0.00158400    
      1.00000           1.54000         0.0134068        0.00170752    
      1.54000           2.40000         0.0136322        0.00218778    
      2.40000           4.80000         0.0189046        0.00245571    
      4.80000           10.0000         0.0191256        0.00364589