# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00479584        0.00399203    
     0.460000          0.700000        0.00867869        0.00320670    
     0.700000           1.00000         0.0131104        0.00323969    
      1.00000           1.54000         0.0158692        0.00351033    
      1.54000           2.40000         0.0141661        0.00433754    
      2.40000           4.80000         0.0190947        0.00504965    
      4.80000           10.0000        0.00514510         0.0100768