For each GC–star pair, confidence level p for the pair against absolute difference in metallicity. The green lines indicate the 0.05 (1σ) and 0.32 (2σ) confidence levels. The yellow line represents an absolute difference in metallicity of 0.3. The blue dots represent pairs with a confidence between 0.05 and 0.32, while the orange dots represent pairs with a confidence greater than 0.32. The most probable pair is represented by the red dots in the bottom right region.