Observed polarization position angle at ALMA band 3, 6, 7, 8, and 9 is compared with prior data from Aitken et al. (2000), Bower et al. (2003; 2005), the mean of Macquart et al. (2006), and Marrone et al. (2006; 2007). The polarization position angles of the Macquart et al. (2006) data were unwrapped by −180°. Vertical error bars are ±1σ uncertainties, which were determined using the procedure introduced in Sect. 3.2. We overplot the mean fitted intrinsic polarization position angle the and rotation measure by Marrone et al. (2007), and the updated fit based only on ALMA band 3, 6, 7 data. Gray curves show 50 independent random realizations which characterize our fitting errors.