Extinction map of the VVV field b201. The values are based on the maps of Gonzalez et al. (2012), using the Cardelli et al. (1989) extinction law, for a resolution of 6′ × 6′. This field is located in the bottom-right corner of the VVV bulge area, within coordinates − 10° ≲ l ≲ −8.5° and − 10° ≲ l ≲ −9°. For a large portion of the area the total extinction A_Ks is lesser than the lower limit computed by the Gonzalez et al. (2012) map, of A_Ks< 0.0001 mag. While the maximum value found is A_Ks = 0.0890 mag, the mean extinction over the entire field is A_Ks = 0.0083 mag. This degree of extinction produces no or negligible effects in the photometric limits used in our target selection.