(General comments about the panels as in Fig. A.1.) IRAS F14544-4255 (IC 4518): this is the western source of the system. It is more compact than the eastern one, although some extended emission is also observed towards the northwest likely associated with two star-forming knots. The velocity field has some irregularities (i.e., two maxima in the redshifted part), although a weak rotation pattern is visible. The velocity dispersion map shows a maximum of 300 km s^-1 on the eastern part of this galaxy at 0.9 kpc from the Hα flux peak. The high values of the velocity dispersion of the narrow component correspond to low-Hα surface brightness spectra. The spectra showing a secondary broad component in this object are quite complex. The spatial scale is 0.32 kpc/′′.