PZ Tel LRS data before (left) and after (right) speckle subtraction. The left image is the spectrum after pre-processing using the DRH pipeline (see Sect. 9.3). The spectrum of the companion PZ Tel B is visible as a straight line surrounded by speckles at an angular separation of ∼0.5″. The obscured part between ±0.2″ corresponds to the position of the opaque coronagraphic mask. The contrast of the companion is ∼5.4 mag in H-band (Biller et al. 2010). The right image present the data after stellar halo and speckles subtraction using the SDI approach described in (Vigan et al. 2008).