Fig. 2
Theoretical ratios (continuous lines) of O iv 1399/1401 Å, 1401/1404 Å and S iv 1404/1406 Å obtained by using the atomic data described in the text. The dotted curves show a ±10% error for the theoretical ratios. The vertical lines indicate the high-density limit of 1012 cm-3 for the O iv ratios and 1013 cm-3 for the S iv ratios.
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