Galactic coordinates of the bulge region, with the black contours as the COBE/DIRBE outline (Jönsson et al. 2017). The small symbols are all RRLs from the OGLE-IV survey (in grey from Soszyński et al. 2014, and in red from Soszyński et al. 2019). The GCs are also shown, with those selected by Bica et al. (2016) as bulge GCs shown in green. The GCs with contours are the ones that contain member RRLs according to Soszyński et al. (2014, 2019). The selected sample of six clusters consists of the objects in common in Bica et al. (2016) and Soszyński et al. (2019), except for NGC 6441.