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Table 3: Summary of the VLA observations. tis the on-source observation time (in hours). $\sigma _{\rm I}$ is the rms noise in the final map of total intensity and $\sigma _{\rm PI}$ the rms noise in the final map of polarized intensity (both in $\mu $Jy/beam). Column 5 gives only noise levels at $\lambda 22$ cm, those at $\lambda 18$ cm are about 30% higher.

$\lambda $22 cm and $\lambda $18 cm $\lambda $6.2 cm $\lambda $3.5 cm

NGC
Date Conf. t $\sigma_{\rm I}/\sigma_{\rm PI}$ Date Conf. t $\sigma_{\rm I}/\sigma_{\rm PI}$ Date Conf. t $\sigma_{\rm I}/\sigma_{\rm PI}$

1097
96 Feb. 3 CnB 0.7 60/40 96 May 20 DnC 0.5   96 May 20      
                  +97 Oct. 7+9 DnC 5.6  
          +98 Nov. 13+15 CnB 9.3 40/20 +98 Nov. 11+14 CnB 9.3 30/15

1300
-"- CnB 1.0 50/40 96 May 20 DnC 1.8 25/25 96 May 20 DnC 2.0 25/20

1365
-"- CnB 1.0 80/60 96 May 20       96 May 20      
          +99 Feb. 19 DnC 6.0 15/15 +97 Oct. 7+9 DnC 5.6 20/15

2336
96 Mar. 10+22 C 1.1 25/25 96 Jul. 22 D 2.0 15/20 96 Jul. 22 D 2.2 20/-

3359
96 Mar. 10 C 0.4 30/25 -"- D 0.7 30/25 -"- D 0.9 30/35

3953
-"- C 0.4 30/20 -"- D 0.7 25/30 -"- D 0.9 30/-

3992
-"- C 0.7 30/25 96 Jul. 22       96 Jul. 22      
          +96 Aug. 17 D 0.7 20/20 +96 Aug. 17 D 0.9 40/25

4535
-"- C 0.4 20/20 96 Aug. 17 D 0.5 20/20 96 Aug. 17      
                  +99 Apr. 2 D 6.6 25/15

5068
97 Jun. 12 CnB 2.0 30/35 96 Jun. 1 DnC 0.8   96 Aug. 17 D 1.2 20/25
          +96 Aug. 17 D 1.1 20/15        

7479
96 Mar. 22       96 Jul. 22 D 0.5 25/30 96 Jul. 22      
  +97 Jul. 2 C 2.1 40/25         +98 Jan. 9+10 D 5.0 20/15




   
Table 4: Summary of the ATCA observations. t is the on-source observation time (in hours). $\sigma _{\rm I}$ is the rms noise in the final map of total intensity and $\sigma _{\rm PI}$ the rms noise in the final map of polarized intensity (both in $\mu $Jy/beam).

$\lambda $13 cm $\lambda $5.8 cm

NGC
Date Conf. t $\sigma_{\rm I}/\sigma_{\rm PI}$ Date Conf. t $\sigma_{\rm I}/\sigma_{\rm PI}$

986
        96 Jan. 20 750C 2  
          +96 Feb. 10+11 750B 3 40/25

1313
        96 Jan. 20 750C 2  
          +96 Feb. 10+11 750B 2 70/25

1433
        96 Jan. 20 750C 2  
          +96 Feb. 10+11 750B 2 40/25

1493
        96 Jan. 20 750C 2  
          +96 Feb. 10+11 750B 2 50/25

1559
96 Oct29 1.5A 5 100/40 96 Jan. 20 750C 2  
          +96 Feb. 10+11 750B 3  
          +96 Nov. 1 750A 11 30/15

1672
93 May19 1.5B 10 * 60/- 92 Mar. 15 375 11  
          +93 Jul. 26 750D 10 **  
          +93 Sep. 9 750C 12 ** 50/25

2442
96 Oct29 1.5A 5 70/60 96 Jan. 19 750C 3  
          +96 Feb. 9+11 750B 4  
          +96 Nov. 2 750A 10  
          +98 Mar. 25 375 9  
          +00 Dec. 31 750C 11 25/25

3059
98 Jan9 1.5A 7 * 60/60 96 Jan. 19 750C 3  
          +96 Feb. 9+11 750B 4  
          +97 Jan. 7 750D 6  
          +98 Apr. 9 750A 10 25/25

5643
        96 Jan. 19 750C 3  
          +96 Feb. 9+11 750B 3 40/25

7552
        96 Jan. 19 750C 3  
          +96 Feb. 9+11 750B 3  
          +99 Jan. 3 375 8  
          +00 Dec. 30 750C 7 100/25

$\textstyle \parbox{11.5cm}{
$*$\space Simultaneous observations at $\lambda$ 22...
...MHz). \\
$**$\space Simultaneous observations at $\lambda$ 3.5~cm (8640~MHz).}$



 \begin{figure}
\par\includegraphics[width=8.8cm,clip]{2373fig14.eps}\hspace*{2.4...
...s}\hspace*{2.4mm}
\includegraphics[width=8.8cm,clip]{2373fig17.eps}
\end{figure} Figure 8: Total intensity contours of NGC 2336, overlayed onto an optical image from the Digitized Sky Surveys. The contours are as in Fig. 6.


 \begin{figure}
\par\includegraphics[width=8.8cm,clip]{2373fig18.eps}\hspace*{2.4...
...s}\hspace*{2.4mm}
\includegraphics[width=8.8cm,clip]{2373fig21.eps}
\end{figure} Figure 9: Total intensity contours and the observed B-vectors of polarized emission of NGC 3359, overlayed onto an optical image from the Digitized Sky Surveys. The contours and the vector scale are as in Fig. 6.


 \begin{figure}
\par\includegraphics[width=8.8cm,clip]{2373fig22.eps}\hspace*{2.4...
...s}\hspace*{2.4mm}
\includegraphics[width=8.8cm,clip]{2373fig25.eps}
\end{figure} Figure 10: Total intensity contours and the observed B-vectors of polarized emission of NGC 3953, overlayed onto an optical image from the Digitized Sky Surveys. The contours and the vector scale are as in Fig. 6.


 \begin{figure}
\par\includegraphics[width=8.8cm,clip]{2373fig34.eps}\hspace*{2.4...
...s}\hspace*{2.4mm}
\includegraphics[width=8.8cm,clip]{2373fig37.eps}
\end{figure} Figure 13: Total intensity contours and the observed B-vectors of polarized emission of NGC 5068, overlayed onto an optical image from the Digitized Sky Surveys. The contours and the vector scale are as in Fig. 6.


 \begin{figure}
\par\includegraphics[width=8.8cm,clip]{2373fig42.eps}
\end{figure} Figure 15: Total intensity contours and the observed B-vectors of polarized emission of NGC 986, overlayed onto an optical image from the Digitized Sky Surveys. The contour levels are 1, 2, 3, 4, 6, 8, 12, 16, 32, 64, 128 $\times $ the basic contour level of 100 $\mu $Jy/beam. A vector of 1 $^{\prime \prime }$ length corresponds to a polarized intensity of 10 $\mu $Jy/beam area.


 \begin{figure}
\includegraphics[width=8.8cm,clip]{2373fig43.eps}
\end{figure} Figure 16: Total intensity contours of NGC 1313, overlayed onto an optical image from the Digitized Sky Surveys. The contours are as in Fig. 15.


 \begin{figure}
\par\includegraphics[width=8.8cm,clip]{2373fig45.eps}
\end{figure} Figure 18: Total intensity contours and the observed B-vectors of polarized emission of NGC 1493, overlayed onto an optical image from the Digitized Sky Surveys. The contours and the vector scale are as in Fig. 15.


 \begin{figure}
\par\includegraphics[width=8.8cm,clip]{2373fig52.eps}\hspace*{2.4mm}
\includegraphics[width=8.8cm,clip]{2373fig53.eps}
\end{figure} Figure 22: Total intensity contours and the observed B-vectors of polarized emission of NGC 3059, overlayed onto an optical image from the Digitized Sky Surveys. The contours and the vector scale are as in Fig. 19.


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