Radio SEDs of HD 93129A for different 3-D separations (left panel) and for different projection angles ψ (right panel). The dotted lines represent the unabsorbed synchrotron emission (which is independent of ψ), the dashed lines the absorption-corrected synchrotron emission, and the solid lines the total emission (summing the contribution from the ionised winds). Values of ψ < 90° correspond to the secondary star being closer to the observer.