# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0105914        0.00692705    
     0.460000          0.700000        0.00476756         0.0100667    
     0.700000           1.54000         0.0107804        0.00476572    
      1.54000           2.40000        0.00922557        0.00950828    
      2.40000           4.80000         0.0162659        0.00862868    
      4.80000           10.0000         0.0241843         0.0140529