Analysis of the polarization properties along the filaments. The top panel shows the positions of the filaments with respect to the observed jet axis (defined as the line joining knots D and A). The black solid line is obtained by joining the points where both filaments cross and suggests that the real jet axis shows some bending. The middle panel shows the values of the fractional polarization averaged over a region of 5 pixels around the central position of the filaments. The width of the lines is the standard deviation. In a similar way, the bottom panel shows the averaged Faraday depth along the filaments. Note that the values on the y-axis are inverted; we show values from positive at the bottom to negative at the top. This has been done only to follow the same sign of Faraday depth shown in the previous RM map.