Angular distribution on the plane of the sky of critical points affected by minor problems. The top panel refers to the Legacy MGS and the bottom panel to LOWZ+CMASS. In each panel, critical points detected by DisPerSE are shown with filled circles, colour-coded according to their type (green: type 2 saddles, red: maxima, brown: bifurcations). Only points of type maximum, type 2 saddle, or bifurcation are shown here as minima, and type 1 saddle points are not affected by the minor problems we consider here. Cyan stars highlight critical points that are affected by minor problems (i.e. superposing maxima and saddles that are connected by a filament of 0 Mpc or maxima connected to only one filament, see text). As an example, the 3σ persistence skeletons have been chosen, with one smoothing cycle of the density field for both the Legacy MGS and LOWZ+CMASS.