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Fig. 4

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Lyman-alpha and 1280 Å brightness curves of growth with Kzz*$K_{zz}^*$. The secondary x-axis indicates the altitudes where nCH4~1cm3${n_{{\rm{C}}{{\rm{H}}_4}}}\~1\,{\rm{c}}{{\rm{m}}^{ - 3}}$. The dashed green line with a shaded green band represents the observed Raman feature brightness and its uncertainty, i.e. 206+1$20_{ - 6}^{ + 1}$ R.

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