Peculiar (non-circular) motions of HMSFRs. Upper left: vectors projected on the Galactic plane; the scale for motions is shown in the lower right corner of the panel. Upper right, lower left and lower right panels show peculiar motion components Us (toward the Galactic center), Vs (in the direction of Galactic rotation) and Ws (toward the north Galactic pole) versus Galactocentric azimuth (β). Peculiar motions assume R₀ = 8.33 ± 0.16 kpc, Θ₀ = 243 ± 6 km s^-1, and solar motion components (U_⊙, V_⊙, W_⊙) = (10.7± 1.8, 12.2 ± 2.0, 8.7 ± 0.9) km s^-1.