Stacked rest-frame VIMOS spectra of 26 member candidates with z = 2.15–2.20 (red solid line in top panel), of 16 members with zflg≥2 (purple solid line in middle panel), and of 12 members with z = 2.15–2.16 (magenta solid line in bottom panel). In all panels, the gray filled region represents the 1σ uncertainty, the dashed green line is a linear fit obtained to estimate the UV spectral slope β, where F_λ ∝ λ^β, and the solid black curve represents the pseudo-continuum obtained by linearly interpolating the average flux density in the "features-free" windows defined in Table 3 in Rix et al. (2004). The vertical dashed lines represent the location of the main spectral features as annotated (nebular: blue, ISM: orange, stellar photosphere: green, stellar winds: red).