Extinction-corrected and foreground-cleaned bulge CMDs for Galactic fields with |ℓ| ≤ 9° (rows), −9° ≤b ≤ −3° (columns), with a step of 1°. Each field contains all the sources within a square of 1 deg². Galactic longitude ℓ increases towards the left of the plot, so that the plot in the top left corresponds to (ℓ,b) = (9° , − 3° ), and the one in the bottom right to (ℓ,b) = (−9° , − 9° ), as shown by the black circles in Fig. 1.