Density map of the strip. Top: region close the LMC, derived by adopting MSTO stars corresponding to intermediate-age (7 ≤ t ≤ 9 Gyr, left panel) and old (t ≥ 10 Gyr, right panel) stellar populations. We selected stars within colour and magnitude ranges of 0.0 ≤ 0.5 mag and 21.4 ≤ g ≤ 21.9 mag for the younger stellar population, and 0.1 ≤ g − i ≤ 0.6 mag and 21.9 ≤ g ≤ 22.4 mag, for the old one, respectively. Each pixel has size of 3′×3′. Bottom: region close the SMC. The region of the CMD adopted to select SMC MSTO stars is 0.0 ≤ g − i ≤ 0.5 mag and 21.8 ≤ g ≤ 22.3 mag for the younger stellar population, and 0.1 ≤ g − i ≤ 0.6 mag and 22.3 ≤ g ≤ 22.8 mag for the ancient one, respectively. Each pixel has size of 2′×2′. We applied a Gaussian Kernel Density Estimator with bandwidth = 0.1° for smoothing all four subplots.