Point-source residuals with noise for the various approaches in a projected region of channel Q, illustrating the lower bias obtained for this channel with the proposed approach. These maps were obtained by subtracting the diffuse component from the point-source-subtracted map. In the first two maps, three negative regions can be visually detected because of the overfitting of the point-source flux in the FIT-C and FIT-L approaches, which is different from the SPSR residual map. This does not display biases that are significantly higher than the noise level.