Spectral subtraction examples of two SB2 systems, with Hα order in the left column and Ca II IRT-a in the right column. Upper row: GZ Leo (2RE J1101+223), a K1V+K1V SB2 star, using the FOCES provided spectrum (M. C. Gálvez et al. 2009). Lower row: LP 395-8 (J20198+229), an M3.0V+M3.5V SB2 system using a spectrum taken by the CARMENES spectrograph, from CARMENES Data Release 1 (I. Ribas et al. 2023). Lines and color codes are as in Figure 5.