SPECTRAL CLASSIFICATION AND PROPERTIES OF THE O Vz STARS IN THE GALACTIC O-STAR SPECTROSCOPIC SURVEY (GOSSS)

J.I.A. and R.H.B. acknowledge financial support from the Chilean Government grants, through the FONDECYT Iniciacion 11121550 and FONDECYT Regular 1140076 projects, respectively. S.S.-D. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) under grants AYA2010-21697-C05-04, and Severo Ochoa SEV-2011-0187, and by the Canary Islands Government under support from [a] the Spanish Government Ministerio de Economia y Competitividad (MINECO) through grants AYA2010-15 081, AYA2010-17 631, and AYA2013-40 611-P and [b] the Consejeria de Educacion of the Junta de Andalucia through grant P08-TIC-4075. C.S.-S. acknowledges support from the Joint Committee ESO-Government of Chile. I.N. and A.M. acknowledge support from the Spanish Ministerio de Ciencia e Innovacion (MICINN) under grant AYA2012-39364-C02-02, and by the Generalitat Valenciana (ACOMP/2014/129). A.M. acknowledges support from the Generalitat Valenciana through the grant BEST/2015/242.