Spitzer IRS spectrum of Par-Lup3-4 showing the silicate feature at 9.8 μm (dashed line). The feature is not detected in absorption and points toward an evolutionary stage closer to Class II than Class I. For comparison, we have overplotted the IRS spectrum of three stellar objects with disks at high inclinations and the silicate feature in emission: SSM-Lup3-1 (Merín et al. 2007), SSTc2d J182915.6+003923 and SSTc2d J162221.1-230403 (Merín et al. 2010).