Metallicity distribution function of the GALAH+TGAS sample. The majority of the stars have solar-like metallicity, [Fe/H], within ±0.5. The distribution is skewed towards metal-poor stars between −2.0 dex and −0.5 dex. The 5, 16, 50, 84, and 95 percentiles are −0.45 dex, −0.28 dex, −0.04 dex, 0.17 dex, and 0.30 dex. respectively. Mean metallicity and standard deviation as well as skewness and kurtosis are indicated in the plot and discussed in the text.
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