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Fig. 1.

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Footprint of the VVV survey in the central bulge of the MW, expressed in Galactic coordinates. Each VVV tile is marked by its respective ID in this diagram, those analyzed in this work being highlighted in blue and using a larger font size. Red dots represent stars classified as Miras in the OGLE-III project. The gray grids present a region of the VVV footprint where our PSF photometry is already completed.

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