Radial profiles of the theoretical images (left panels) and simulated observations (right panels) of a 3   Myr disc with a planet of mass M_p =  [1,9,15]    M_Jupfrom upper to lower panels in the R (0.65   μm), H (1.6   μm), and 850   μm bands. Solid lines correspond to intensity (I) profiles while dashed lines correspond to polarised-intensity (PI). The vertical dotted black line indicates the radial position of the planet at 20   AU.