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Table 2

Spectral indices for WISE J0720, defined by Kirkpatrick et al. (1999), and measured on our SALT spectra (the grating setup is given in brackets).

Index Value Sp. type Index Value Sp. type

Rb-a 1.15 (GR900) M7–L0 Cs-b 1.16 (GR1800) L2–L4
Rb-b 1.25 (GR1800) L0–L2 Cs-b 1.12 (GR900) L0–L3
Rb-b 1.15 (GR900) M7–L0 TiO-a 1.82 (GR900) M9-L0
Na-a 1.20 (GR1800) M9–L2 TiO-b 1.82 (GR1800) M9-L1
Na-a 1.19 (GR900) M9–L2 TiO-b 1.85 (GR900) M9-L1
Na-b 1.35 (GR1800) M7–L0 CrH-b 1.04 (GR1800) M8-L2
Na-b 1.33 (GR900) M7–L0 CrH-b 1.01 (GR900) M8-L2
Cs-a 1.18 (GR1800) L1–L3 FeH-a 1.12 (GR1800) M7-9
Cs-a 1.20 (GR900) L1–L3 FeH-a 1.12 (GR900) M7-9

Notes. The derived spectral types from the spectral sequences in Kirkpatrick et al. (1999; Figs. 8–10) are listed.

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