# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.169729        0.00347923    
     0.460000          0.700000          0.166986        0.00342965    
     0.700000           1.00000          0.155094        0.00377217    
      1.00000           1.54000          0.148507        0.00332852    
      1.54000           2.40000          0.134497        0.00414355    
      2.40000           4.80000          0.111769        0.00471372    
      4.80000           10.0000         0.0893069        0.00650424