# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0357999        0.00478373    
     0.460000          0.700000         0.0378054        0.00467735    
     0.700000           1.00000         0.0191857        0.00576838    
      1.00000           1.54000         0.0333512        0.00519679    
      1.54000           2.40000         0.0317243        0.00741705    
      2.40000           4.80000         0.0186079         0.0122829    
      4.80000           10.0000         0.0420690         0.0196363