Fig. 10.
Top: histogram of the F555W − F814W colour for all sources on the WF4 chip, showing how Source A is clearly redder than the vast majority of these. Bottom: colour-magnitude diagram of the sources found by DOLPHOT in the vicinity of AT 2019zhd. The grey density plot shows all sources detected at > 5σ on the WF4 chip, while the red points show sources within the 2″ × 2″ region shown in Fig. 9. Sources A, B and C as discussed in the text are labelled.
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