Left: correlation of polarization fractions in emission with those in extinction for the joint fit in Q (black) and U (blue). Using Eq. (15) the best linear fit (red line) has slope and y-intercept − 4.13 ± 0.06 and 0.0006 ± 0.0007, respectively. The Pearson correlation coefficient is − 0.93 and . Right: correlation of polarized intensity in emission (MJy sr^-1) with the degree of interstellar polarization. Using Eq. (16), the best linear fit (red line) has slope and y-intercept (− 5.32 ± 0.06) MJy sr^-1 and (0.0020 ± 0.0009) MJy sr^-1, respectively. The Pearson correlation coefficient is − 0.95 and . Lines for the independent fits to Q (black) and U (blue) are also shown.