Tests on the linearity of the measured galaxy shape against the shear applied on the first neighbour (upper panel) and the second neighbour (lower panel). Solid lines connecting the dots are the results when the third galaxy is removed, while the dashed lines connecting the hollow triangles are when it is present. Blue points are the first component of the galaxy ellipticity, and red points are the second. The elements of R to each neighbour are calculated by fitting the points to a linear function.