Toy model showing what 3D velocity JO206 needs to have within the IIZw108 cluster in order to experience the same P_ram as JO201 (normalised by the gravitational restoring force Π_gal), as a function of 3D distance of JO201 from the centre of the A 85 cluster. The blue curve indicates equal ram pressure strengths by the ICM of the clusters hosting JO201 (A 85) and JO206 (IIZw108) relative to the galaxies’ restoring force. Hatched vertical and horizontal regions represent forbidden regions given the measured, projected cluster-centric radius and velocity of JO201 and JO206, respectively. The quantities and are kept constant at their measured, projected values of 655.5 km s⁻¹ and 360 kpc, respectively.