Comparison between the delay due to a source obtained by numerical maximization of Eq. (5), against that expected from Eq. (18). The delays due to Cyg A (left two columns) and Vir A (right two columns) for three different latitudes (different rows) are shown. The columns titled “Numerical” correspond to delay values obtained by numerically maximizing Eq. (5) over θ. The columns titled “Equation” correspond to the delay values for the baseline responsible for maximum power as predicted by Eq. (18). The slanted stripes indicate regions where the phase center is below the physical horizon.