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Fig. 2

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Density distribution in the (rz)-plane in the domain r ∈  [0,rmax] , z ∈  [0,L/2]  for prominence thread models with non-uniform radial and longitudinal structuring. The threads are defined by a cool and dense part with density, ρf and length Lthread and an evacuated part of the tube with density ρev and length L − Lthread. These two regions connect non-uniformly to the coronal surrounding medium with density ρc. Depending on the value of ρev, three different situations are possible: a) ρev = ρc; b) ρc ≤ ρev ≤ ρf; and c) ρev ≤ ρc.

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