Testing the effect of the disk base density (left column, blue), vertical scale height (middle column, green), and inclination angle (right column, red) on the V/R variations (top and center row) and V band polarization (bottom row) predicted by HDUST models. The black solid line represents Model 3, taken here as a reference for our tests. The model parameters are summarized in Table 2. For clarity, we limited the V/R observational sample at Cycle I only and plotted it in light gray.