All Figures

$\begin{figure} \par\includegraphics[width=5.5cm,clip]{6005fig1.eps} \end{figure}$ Figure 1: DSS-image of NGC 5218 and NGC 5216.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig2.eps}\end{figure}$ Figure 2: Integrated intensity ( upper panel), velocity field ( middle panel) and velocity width ( lower panel) of NGC 5218 derived from the UV-tapered (65 k $\lambda$ ) naturally weighted data. The integrated intensity contours are in percent of the peak value of 86 Jy km s^-1 per beam of $4\hbox{$.\!\!^{\prime\prime}$ }38$ $\times$ $4\hbox{$.\!\!^{\prime\prime}$ }08$ . The levels are 1.7, 3, 5.2, 9, 15.6, 27, 46.8 and 81%. The integrated intensity gray scale range is from 0 to 80 Jy km s^-1 beam^-1. The velocity field contours are from 2820 to 3000 km s^-1, with 20 km s^-1 increments. The velocity field grey scale range is from 2800 to 3020 km s^-1. The velocity width contours are 30, 40, 50, 60 and 70 km s^-1 and the velocity width grey scale is from 0 to 70 km s^-1.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig3.eps}\end{figure}$ Figure 3: Position-velocity diagram derived from the UV-tapered (65 k $\lambda$ ) naturally weighted data. The position-velocity diagram is averaged over a 2'' wide slit posotioned as the rectangle in the upper panel. The contour levels in the position-velocity diagrams start at 50 mJy beam^-1 and increase with a factor of 1.2 per level.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig4.eps}\end{figure}$ Figure 4: Onsala 20-m single dish cross map, with spectra toward the center, offset 30'' in each direction and offset 45'' to the east and west.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig5.eps}\end{figure}$ Figure 5: Integrated intensity ( upper panel), velocity field ( middle panel) and velocity width ( lower panel) of NGC 5218 derived from the robustly weighted (robustness parameter -4) data. The integrated intensity contours are in percent of the peak value of 34 Jy km s^-1 per beam of $1\hbox{$.\!\!^{\prime\prime}$ }79$ $\times$ $1\hbox{$.\!\!^{\prime\prime}$ }38$ . The levels are 5 $\times$ (1.4, 2, 2.8, 4, 5.6, 8, 11.2, and 16)%. The integrated intensity gray scale range is from 0 to 34 Jy km s^-1 beam^-1. The velocity field contours are from 2820 to 2940 km s^-1, with 10 km s^-1 increments. The velocity field grey scale range is from 2800 to 3020 km s^-1. The velocity width contours are 30, 40, 50 and 60 km s^-1 and the velocity width grey scale is from 30 to 60 km s^-1.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig6.eps}\end{figure}$ Figure 6: Position-velocity diagram derived from the robustly weighted (robustness parameter -4) data. The position-velocity diagram is averaged over a 0.8'' wide slit positioned as the rectangle in the upper panel. The contour levels in the position-velocity diagram start at 5 mJy beam^-1 and increase with a factor of 1.2 per level.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig7.eps}\end{figure}$ Figure 7: MERLIN radio continuum at 1.4 GHz, uv-tapered (700 k $\lambda$ ) and convolved with a 500 mas beam. The noise level is 0.35 mJy per beam, and the contour levels start at 0.7 mJy and increase with a factor of $\sqrt {2}$ per level. The gray scale range is from 0 to 5 mJy. The spectrum is averaged over the central 1'', indicated by the dashed circle.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig8.eps}\end{figure}$ Figure 8: MERLIN radio continuum derived from the robustly weighted data set. The levels start at 3 $\sigma$ (0.17 mJy), and increase with a factor of $\sqrt {2}$ per level. The grey scale range is from 0 to 1 mJy.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig9.eps}\end{figure}$ Figure 9: Onsala Space Observatory detection of HCN and HCO⁺ toward the center of NGC 5218.
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In the text

$\begin{figure} \par\includegraphics[width=8.1cm,clip]{6005fig10.eps}\end{figure}$ Figure 10: Low resolution CO integrated intensity contours overlayed on a 2MASS K-band image. The OVRO primary beam diameter is 60'', which is outside of this image (33'' $\times$ 46'').
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig11.eps}\end{figure}$ Figure 11: The upper panel shows the CO integrated intensity of the OVRO robust -4 weighted data in contours. The greyscale is the robust -4 weighted MERLIN radio continuum at 1.4 GHz. The middle panel is the position velocity diagram of the OVRO data. The dashed box marks the components associated with the rotating molecular ring. The arrows point at additional kinematical components not associated with the ring. The dashed circle marks the possible extent of an expanding shell of molecular gas. The lower panel shows the naturally weighted MERLIN radio continuum at 1.4 GHz in greyscale. The contours are the H I-absorption toward the background continuum at two different velocities, centered at 2862 ${\rm km~s}^{-1}$ (white contour) and 2889 ${\rm km~s}^{-1}$ (black contour). The contour level is -1 mJy.
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In the text

$\begin{figure} \par\includegraphics[width=5.5cm,clip]{6005fig1.eps} \end{figure}$	Figure 1: DSS-image of NGC 5218 and NGC 5216.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig3.eps}\end{figure}$	Figure 3: Position-velocity diagram derived from the UV-tapered (65 k $\lambda$ ) naturally weighted data. The position-velocity diagram is averaged over a 2'' wide slit posotioned as the rectangle in the upper panel. The contour levels in the position-velocity diagrams start at 50 mJy beam^-1 and increase with a factor of 1.2 per level.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig4.eps}\end{figure}$	Figure 4: Onsala 20-m single dish cross map, with spectra toward the center, offset 30'' in each direction and offset 45'' to the east and west.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig6.eps}\end{figure}$	Figure 6: Position-velocity diagram derived from the robustly weighted (robustness parameter -4) data. The position-velocity diagram is averaged over a 0.8'' wide slit positioned as the rectangle in the upper panel. The contour levels in the position-velocity diagram start at 5 mJy beam^-1 and increase with a factor of 1.2 per level.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig7.eps}\end{figure}$	Figure 7: MERLIN radio continuum at 1.4 GHz, uv-tapered (700 k $\lambda$ ) and convolved with a 500 mas beam. The noise level is 0.35 mJy per beam, and the contour levels start at 0.7 mJy and increase with a factor of $\sqrt {2}$ per level. The gray scale range is from 0 to 5 mJy. The spectrum is averaged over the central 1'', indicated by the dashed circle.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig8.eps}\end{figure}$	Figure 8: MERLIN radio continuum derived from the robustly weighted data set. The levels start at 3 $\sigma$ (0.17 mJy), and increase with a factor of $\sqrt {2}$ per level. The grey scale range is from 0 to 1 mJy.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{6005fig9.eps}\end{figure}$	Figure 9: Onsala Space Observatory detection of HCN and HCO⁺ toward the center of NGC 5218.
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$\begin{figure} \par\includegraphics[width=8.1cm,clip]{6005fig10.eps}\end{figure}$	Figure 10: Low resolution CO integrated intensity contours overlayed on a 2MASS K-band image. The OVRO primary beam diameter is 60'', which is outside of this image (33'' $\times$ 46'').
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