Toy model to explain the NW filaments as limb-brightened edges of an outflow cone. We assume a cone filled with a hot wind fluid that is surrounded by walls filled with ionised hydrogen in recombination equilibrium (T = 2 × 10⁴ K, n = 0.05 cm⁻³). Details on the setup and the model parameters that are derived from the observations are given in the text. The left panel shows a projection of the resulting Hα emission (as surface-luminosity in erg s⁻¹ kpc⁻¹) from this model along the Y-axis of the model box; this axis is chosen to be parallel to the line of sight. The right panel shows how the Hα emission from this model would appear in our MUSE data under the assumption that the model is at the distance of SBS 03352−052E. Here we overlay some Hα contours from Fig. 1 (dotted white lines) to indicate the degree of congruence between the simulated observations of this simple toy model and reality.