# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0991406        0.00337223    
     0.460000          0.700000         0.0882704        0.00323567    
     0.700000           1.00000         0.0759311        0.00387292    
      1.00000           1.54000         0.0686435        0.00322852    
      1.54000           2.40000         0.0704465        0.00398536    
      2.40000           4.80000         0.0458940        0.00469372    
      4.80000           10.0000        0.00985094        0.00640816