Outcome of the input/output analysis of our fitting procedure, modeling sources of known profiles in mock images. The simulations matching the [C II] and [N II] maps are shown at the top and bottom, respectively. From left to right: we show how our method recovers the total flux, the flux inside the center, the flux in the outskirts, and the ratio of center-to-total (with “center” and “outskirts” as defined in the main text). The red line is the line of perfect agreement.