Median VIMOS spectrum of 31 BzK-selected massive quiescent galaxies in the COSMOS field, with a median redshift of z=1.5. The observations were carried out during ESO programs 086.A-0681 and 088.A-0671 using the medium resolution grism and GG475 order-sorting filter, with a slit width of 1-arcsec. The 2D data were reduced with VIPGI pipeline, and corrected for redshift and cosmological dimming before stacking. The 1D spectrum was extracted using a 12-pixel aperture. <P />(1 data file). <P />