Target information. (a) Spatial distribution of target stars in Fnx dwarf galaxy. The black ellipse indicates the tidal radius of Fnx and its center is labeled with black cross. Target stars from Reichert et al. (2020, hereafter R20) and this work are marked as blue triangles and red dots, respectively. The N-rich stars are further marked with red circles. The black stars represent GC Fnx 1-5 while the purple star represents GC Fnx 6. (b) Color-magnitude diagram of Fnx stars based on Gaia DR3 (gray dots).