HD 61005 minor axis profile (top) from the south (minus minor axis direction) to the north (positive minor axis direction), and its associated difference profile about the image centre (bottom). We show as red and green dash-dot lines the ±3σ and ±5σ profile differences, and in amber the error associated with the difference profile, scaled by $\sqrt{2}$ to account for the uncertainty in the self-subtraction of the profile.