Metallicity gradient, where R_GC is the projected Galactocentric distance and the R_Guide is obtained from the average between apocenter and pericenter. Blue circles represent the 49 OCs of this work. In panels a and b, the red lines represent the median of [Fe/H] for each 1.5 kpc range: 6–16.5 kpcs (panel a) and 6–15 kpcs (panel b); the pink strip represents the median absolute deviation (MAD) of [Fe/H]. In panels c and d, the red lines were obtained with two linear regressions: in panel c, the first in the 6–11.5 kpc interval (solid line) and the second in the 11.5–16.5 kpc interval (dashed line); in panel d, the first in the 6–10.5 kpc interval (solid line) and the second in the 10.5–15 kpc interval (dashed line). In panels c and d, we compare our results with the Spina et al. (2022, purple lines), Myers et al. (2022, orange lines), and Magrini et al. (2023, green lines) results. Panels e and f separate the OCs by age: 17 OCs aged less than 1 Gyr (green circles), 13 OCs with ages between 1 and 2 Gyr (red circles), and 19 OCs aged greater than 2 Gyr (orange circles). The lines in panels e and f are the linear regressions for each of these groups of OCs: green line (OCs aged less than 1 Gyr), red line (OCs with ages between 1 and 2 Gyr), and orange line (OCs aged greater than 2 Gyr). In panels g and h, all OCs of ages under 2 Gyr are represented by gray circles, while the black line is the linear regression of these OCs. The OCs ages were obtained from Cantat-Gaudin & Anders (2020) and are aged 0.02 to 4.00 Gyr. The lines (linear regressions) this work in panels c–h were determined with the sklearn.linear_model package in Python (Pedregosa et al. 2011). Ages were obtained from Cantat-Gaudin & Anders (2020).