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. 2023 Dec 23;527(4):12120–12139. doi: 10.1093/mnras/stad3973

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© 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Observed (V − I)–V reddening map of M4, indicating variations in extinction, ΔA_V, relative to the cluster average. Spectroscopic targets are marked by black crosses, while X marks the centre of the cluster. The blue colour indicates areas with less reddening, while red coloured areas are affected by a higher degree of reddening. The coordinate system is normalized to the cluster centre at RA = 16^h26^m45.12^s, Dec. = 26°18′35.4″.