Regions defined by the different intersections of the masks considered for the recovery of the ISW signal, using the LCB filter. To produce this figure, for each mask we construct a map with a constant value given by in the excluded pixels and zero otherwise. These maps are then added together, producing the pattern seen in the figure. In particular, we choose k_m = { 2,4,8,16,32,64 } corresponding to the masks used for Kappa, NVSS, SDSS-CMASS/LOWZ, SDSS-MphG, CMB, and WISE, respectively (the square root function is introduced to allow for a better visualization).