# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0391323        0.00799841    
     0.460000          0.700000         0.0500260        0.00678086    
     0.700000           1.00000         0.0659315        0.00817394    
      1.00000           1.54000         0.0668757        0.00777963    
      1.54000           2.40000         0.0808517         0.0110357    
      2.40000           4.80000         0.0794258         0.0153452    
      4.80000           10.0000         0.0714223         0.0328099