Maps of the weights for each patch of the sky where the ILC was applied for the 860 GHz frequency band. The weights were computed from simulations that included all Galactic foregrounds and extragalactic components (see Table 1) at the sensitivities, beam sizes, and frequencies of SO LAT and FYST (see Table 2) and with 90% correlated atmospheric red noise generated using the noise curves given by Choi et al. (2020a), (see Fig. 3).