# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.117982        0.00513254    
     0.460000          0.700000          0.114914        0.00404570    
     0.700000           1.00000          0.100662        0.00346014    
      1.00000           1.54000          0.110800        0.00244589    
      1.54000           2.40000          0.105843        0.00254418    
      2.40000           4.80000          0.103907        0.00298489    
      4.80000           10.0000         0.0945512        0.00398206