# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0224158         0.0228397    
     0.460000          0.700000         0.0208278         0.0197209    
     0.700000           1.00000         0.0351244         0.0208364    
      1.00000           1.54000         0.0274711         0.0114741    
      1.54000           2.40000         0.0129643         0.0105813    
      2.40000           4.80000         0.0107921        0.00951374    
      4.80000           10.0000        0.00494964         0.0146674