Simulated images of GCs added to the Euclid VIS image of NGC 2403, next to the clusters D6 (top), JC15 (centre), and a new candidate closer to the centre of NGC 2403 (bottom). In each panel, simulated GCs are shown for masses of 10⁵ M_⊙, 3 × 10⁵ M_⊙, and 10⁶ M_⊙ (left to right) a half-light radius of 3 pc, and an assumed age of 10 Gyr. Each panel measures 295 × 70 VIS pixels ($29\stackrel{″}{.}5\times 7\stackrel{″}{.}0$).