All the spatial components of U Her listed in Table 3 plotted on the sky. Each component is represented by a symbol surrounded by a circle with a diameter d depending on flux density S_ν: d = 8 (log S_ν + 1.3). The dates are represented by different symbols: Feb. 90 by small circles; Jun. 90 by asterisks; Oct. 91 by plus signs; Dec. 92 by crosses. The circles around the components are colour coded according to the V_los of the component (see the scale below the map). The dashed circle with a radius of 57 mas has been obtained from a fit to the components with velocities −18 < V_los < −14 km s⁻¹ (see text) and the origin of the plot has been moved to the centre of this circle. The filled black circle at the centre symbolises the central star with a diameter of 10.65 mas (van Belle et al. 1996).