First row: sequence of simulated G-band images over time. The green box encloses the area where MBP3 is seen to appear and disappear. Second row: sequence of simulated Stokes-I profiles from the centre of MBP3 (solid) and these degraded to the SOT spatial resolution (dotted). Third row: sequence of Stokes-V profiles (solid) with these degraded to the SOT spatial resolution (dotted). Fourth row: sequence of Stokes profiles (solid) with these degraded to the SOT spatial resolution (dotted). All profiles are normalised to the average continuum intensity, Ic.