A toy model of the average profile from two cone-like emission regions, centred on the magnetic axis. For the smaller cone, the LOS does not cut through the inner side of the cone. Gray profiles correspond to a uniformly illuminated cone (not shown); black profiles result from the cones with smooth variation of intensity with magnetic azimuth. The dotted line shows the merging component fit model. Vertical dashed lines mark the peaks of the uniformly illuminated cone profiles. On the upper subplot, note the slight change in apparent position of the leading component for the varying radial intensity case.