Table 1.

Spectroscopic metallicity determinations of evolved and unevolved stars in M4.

Reference	[Fe/H]	Number of stars	Evolutionary states
Mucciarelli et al. (2011)	−1.08	35	TOP
Mucciarelli et al. (2011)	−1.12	52	SGB/RGB
Monaco et al. (2012)	−1.31	71	MS
Monaco et al. (2012)	−1.17	10	SGB/RGB
Malavolta et al. (2014)	−1.16	1869	MS/SGB
Malavolta et al. (2014)	−1.07	332	SGB/RGB
Spite et al. (2016)	−1.20	71	TOP
Spite et al. (2016)	−1.10	10	SGB
Marino et al. (2008)	−1.07	105	RGB
Marino et al. (2017)	−1.20	17	AGB
Wang et al. (2017)	−1.14	68	RGB
Wang et al. (2017)	−1.18	19	AGB
MacLean et al. (2018)	−1.17	106	RGB
MacLean et al. (2018)	−1.20	15	AGB/HB
This work	−1.20	34	TOP
This work	−1.13	35	RGB