Table 3: Preliminary classification of the candidates with J-band photometry.

	T dwarfs	L dwarfs	quasars	M dwarfs	artefacts
Number of	23	57	4	109	22
objects
Percentage	10.7%	26.5%	1.9%	50.7%	10.2%

This classification is based on their position in the i'-z' versus z'-J colour-colour diagram.