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Fig. 2

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Model selection strategy: if both parameters (Θg,fp) are constrained on the plane, we see a resolved and an unresolved emitter (case 1). If only fp is constrained, there are two emitters but we can give only limits to their sizes (case 2). If neither Θg nor fp are constrained, there is only one component which is either marginally resolved (case 3) or entirely unresolved (case 4).

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