Best-fit SEDs of the central QSO (UM287) and companion QSO (CompQSO) in the Slug nebula. The best-fit model is shown in gray, while the individual contribution for each templates are shown in different colors: in green we show the AGN emission; the dust emission is displayed in orange; the stellar unattenuated and attenuated models are the dotted blue and solid yellow lines; the radio emission is highlighted in purple. Points and upper limit are shown as empty light-blue circles and red filled triangles, respectively.