Fig. 4.
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Comparison between abundance ratios of PAGB star of E3 and other GCs. PAGB stars with 3DU evidence are shown as blue asterisks; those with no 3DU evidence are shown as black asterisks. The newly identified PAGB star of E3 is shown as a red asterisk. The left panel shows C/CNO versus C abundance plot, whereas the right panel shows N/O vs. O abundance plot.
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