Comparison of the APOGEE-2 LMC stars with different S/N. The small red dots are stars with S/N between 35 and 70, and the small gray dots represent stars with S/N > 70. We divided the sample, according to metallicity, into four groups over the range −2.0 to 0.0 dex to obtain the median and dispersion of the stars at different representative metallicities. The filled large red and gray circles with error bars respectively represent these values.