Normalized intensity difference of the XX and YY correlations of Sgr A*, observed by the ALMA 12 m array (symbols), and a black curve representing our best fit to these data. The constant polarization percentage and polarization position angle obtained from our best fit model are 14% ± 1.2% and 158°± 3°, respectively. The gray curves show 50 independent random realizations of models with constant polarization percentage and polarization position angle, which characterize the error bars we give. We caution that these quantities are not fully constrained without the measurements of the XY and YX correlations.