# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.244139        0.00549532    
     0.460000          0.700000          0.255409        0.00475429    
     0.700000           1.00000          0.202146        0.00565131    
      1.00000           1.54000          0.210760        0.00404935    
      1.54000           2.40000          0.204310        0.00371219    
      2.40000           4.80000          0.167859        0.00361639    
      4.80000           10.0000          0.156181        0.00492017