Relationship between magnesium mass and oxygen zone filling factor derived from the oxygen and magnesium (Mg I λ1.504 μm) recombination lines in SN 2011dh. The solid line is the best estimate and the dashed lines show the error bars. The MMg-fO combinations of some models are shown as crosses. Also shown (as horizontal dotted lines) are the magnesium masses corresponding to a solar Mg/O ratio for the O masses for different MZAMS from WH07. The Mg/O ratio in the models is about half the solar Mg/O ratio. The regions ruled out by constraints from the [O I] λλ6300, 6364 lines are shaded grey.
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