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Fig. E.1.
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Silicon ionisation balance. Red is for Si II; the solid line is for Si IIλ6347, the dashed line is for Si IIλ6371. Blue is for Si III; the solid, dashed, dash-dotted lines are for Si IIIλλ4552, 4567, 4572, respectively. The shaded regions show the estimated uncertainties for each line.
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