Relative elemental abundance ratios with respect to the Sun ([X/Fe]) for all stars as a function of atomic number. When the element is Fe, the relative elemental abundance is [Fe/H]. The red dots with red lines represent the abundance patterns of the three stars tagged as cluster stars according to our chemical tagging technique (see Sect. 4), while circles with dotted lines represent the abundance patters of the other stars in our sample. The dashed line indicates the solar abundance. The grey break in the x-axis is due to the cut of blank space between Y and Ba elements.