Atomic lines and dust features that mainly characterize the spectra of the PNe. Left: atomic lines in the HST/STIS spectrum of SMP LMC 71. Right: Mid-IR Spitzer/IRS spectra of SMP LMC 71 (top), SMP LMC 25 (middle), and SMP LMC 81 (bottom). The upper right panel shows the atomic nebular emission lines and the classical PAH features, while the middle and lower panels display the dust features typically observed in LMC CRD and ORD PNe, respectively.