(Top) Measured circular polarization ratio from Goldstone (from Table 4) and (bottom) measured circular polarization ratio from the GBT (from Table 5). The horizontal dashed lines indicate the weighted means of the ratios, which are 1.44 for Goldstone and 1.46 for GBT. The error bars on our polarization ratios are taken to be the uncertainty calculated in Equation (3). The color bar on the right shows the dates of our observations in YYMMDD. The x-axis is the subradar point west longitude.