Fig. 23.
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Heliocentric maps of ΔVi, i.e. (VZ > 0 − VZ < 0), for the components i = ϕ, R, Z, in the RGB sample (top) and the OB star sample (bottom). The NIR two-arm spiral model (black) from Drimmel (2000) is overplotted as well as are the Perseus (red), and the Local (cyan) Arms model from Reid et al. (2019). The position of the Sun is indicated by the black dot at (x, y) = (0, 0).
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