The correlation coefficient R(n, n_s) (Equation (6)) plotted in equatorial (R.A., decl.) sky coordinates. The direction that CHORD is pointing at an instant, n_p, is indicated with the ×. In this case, CHORD is pointed at its zenith. The source position u_s is indicated by the box □. The wavelength is set to 21 cm. A grid of locations yields R(n, n_s) = 1, which are perfect aliases.