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Table 1:

Spectroscopic observations.

Object
Jb Opt. Instrument Date $T_{\rm exp}$d Airmass $\Delta$airmass $_{\rm T-S}$ S/N Near-IR
  (mag) SpTc     (min)       SpT

PPl 1
15.36 $\pm$ 0.01 M6.5 NICS(JHK) 2002 Oct. 31 8 $\times$ 2 1.08 0.14 50 M7.0 $\pm$ 0.5
Calar 3 16.08 $\pm$ 0.01 M8 NICS(JHK) 2002 Oct. 31 8 $\times$ 2 1.15 0.07 49 M8.0 $\pm$ 0.5
Teide 1 16.21 $\pm$ 0.01 M8 NICS(JHK) 2002 Nov. 27 8 $\times$ 2 1.03 0.73 32 M8.0 $\pm$ 0.5
BRB 17 17.41 $\pm$ 0.03 ... LIRIS(zJ,HK) 2006 Dec. 28 (12, 18) $\times$ 2 1.74, 1.41 0.44, 0.89 4, 6 L0.0 $\pm$ 1.0
PLIZ 28 17.60 $\pm$ 0.04 ... NICS(JHK) 2005 Nov. 20 15 $\times$ 2 1.11 0.57 18 L0.0 $\pm$ 1.0
PLIZ 35 18.07 $\pm$ 0.05 ... NICS(JHK) 2005 Sep. 18 65 $\times$ 0.6 1.03 -0.03 15 L2.0 $\pm$ 1.0
BRB 21 18.14 $\pm$ 0.06 ... NICS(JHK) 2005 Sep. 18 80 $\times$ 0.5 1.21 0.15 7 L3.0 $\pm$ 1.0
BRB 23 18.23 $\pm$ 0.04 ... NICS(JHK) 2007 Feb. 7 10 $\times$ 5 1.33 -0.27 14 L3.5 $\pm$ 1.0
BRB 29 18.69 $\pm$ 0.10 ... LIRIS(HK) 2006 Dec. 29 12 $\times$ 2 1.09 -0.02 3 L4.5 $\pm$ 1.5
J0829a 12.80 $\pm$ 0.03 L2V LIRIS(zJ,HK) 2006 Dec. 28 (4, 6) $\times$ 1.5 1.38, 1.36 0.80, 0.94 29, 37 L2.0 $\pm$ 1.0

Notes. (a) SSSPM J0829-1309. (b) From the Galactic Clusters Survey (GCS) component of UKIDSS (Lawrence et al. 2007, sixth data release) for the Pleiades members and from 2MASS (Skrutskie et al. 2006) for the field object. (c) From Martín et al. (1996) for the three Pleiades objects and from Scholz & Meusinger (2002) and Lodieu et al. (2005) for the field object. (d) Dithers $\times$ detector integration time.


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