# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0137173        0.00308163    
     0.460000          0.700000         0.0189673        0.00267556    
     0.700000           1.00000         0.0256996        0.00264394    
      1.00000           1.54000         0.0196967        0.00281619    
      1.54000           2.40000         0.0293392        0.00310664    
      2.40000           4.80000         0.0313451        0.00423081    
      4.80000           10.0000         0.0166962         0.0108111