Ellipticities of the 29 Galactic GCs in our sample measured using the robust PCA method compared with the estimates from the literature provided by White & Shawl (1987, left), Chen & Chen (2010, middle), and Cruz Reyes & Anderson (2024, right). The solid lines indicate equal ellipticities. Each GC is represented by a coloured point (see the legend at the top), and error bars are indicated.