Table 1: Elements with their coronal abundances and ionisation potentials at $T \gg 10^8$ K.

Element		 Z Az AzZ2 AzZ4 $V_z = Z^2\chi$ (keV)
H 1 1 1 1 0.0136
He 2 0.096 0.384 1.536 0.0544
C 6 3.57 $\times$ 10-4 0.013 0.463 0.490
O 8 8.57 $\times$ 10-4 0.055 3.511 0.870
Ne 10 1.07 $\times$ 10-4 0.011 1.071 1.360
Mg 12 1.33 $\times$ 10-4 0.019 2.755 1.958
Si 14 1.27 $\times$ 10-4 0.025 4.871 2.666
S 16 1.61 $\times$ 10-5 0.0041 1.053 3.482
Ca 20 8.50 $\times$ 10-6 0.0034 1.360 5.440
Fe 26 8.61 $\times$ 10-5 0.058 39.336 9.914
Ni 28 6.95 $\times$ 10-6 0.0054 4.27 10.662
      $\Sigma = 1.58$ $\Sigma = 61.2$  


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