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tokens: We thank the anonymous referee for the useful comments. We also thank Terry Mahoney for revising the English of this paper. This work is based on observations made with the Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, on the island of La Palma. This paper is also based on observations made with ESO Telescopes at the Paranal Observatory under program ID 090.C-0766 and also includes data gathered with the 6.5 m Magellan Telescopes at Las Campanas Observatory, Chile. This research has benefited from the SpeX Prism Spectral Libraries 11 11 http://pono.ucsd.edu/adam/browndwarfs/spexprism and the Montreal Brown Dwarf and Exoplanet Spectral Library, 12 12 https://jgagneastro.wordpress.com/the-montreal-spectral-library/ maintained by Adam Burgasser and by Jonathan Gagné, respectively. This research is partly financed by the Spanish Ministry of Economy and Competitivity through projects AYA2014-54348-C3-2-R, AYA2015-69350-C3-2-P, AYA2016-79425-C3-2-P, and the Chilean FONDECYT Postdoctoral grant 3140351. K.P.R. acknowledges CONICYT PAI Concurso Nacional Inserción en la Academia, Convocatoria 2016 Folio PAI79160052. Facilities: VLT (ISAAC), GTC (OSIRIS), Magellan (FIRE).