Residual significance maps from the Fermi-LAT analysis in a zoomed region of the ROI. In the upper panel, the map without the addition of the cloud templates to the model is shown, whereas they are included in the lower panel. In each plot, the cloud templates have overlaid coloured contours indicating the gas density distribution. Additionally, all other 4FGL sources are marked together with massive stellar clusters from Preibisch et al. (2011).