Online Material

Appendix A: Atlas

The Appendix contains summary panels for all galaxies of our sample (Figs. A.1-A.11) and channel maps for the galaxies from the rotation curve sub-sample (Figs. A.12-A.17).

The summary panels consist of two rows with three panels each, and contain the following maps:

Top row: Left panel: zeroth moment map with grayscales. Unless mentioned otherwise, grayscales run from a column density of $n_{\rm HI}=1\times 10^{19}\ {\rm cm}^{-2}$ (white) to $n_{\rm HI}=2\times 10^{21}\ {\rm cm}^{-2}$ (black). The 3 $\sigma$ level is indicated by the black contour. Middle panel: first moment map. The systemic velocity is indicated by the thick contour, the contours are spaced by 10 km s^-1. The approaching side can be identified by the light grayscales and black contours, and the receding side by dark grayscales and white contours. Right panel: second moment map. Grayscales run from 2 to 40 km s^-1. Unless mentioned otherwise, the contours levels are given at 5, 10, and 15 km s^-1. For all moment maps, the beam size is indicated in the bottom right corner. Additionally, if a kinematic center has been independently derived, it is indicated in all moment maps by a cross.

Bottom row: Left panel: major axis position-velocity diagram. The position angle of the slice indicated in the top-left corner of the panel. Grayscales run from 2 $\sigma$ to 30 $\sigma$ , and contour levels are given at $2\sigma + n \times 4\sigma$ (i.e., 2, 6, 10, 14, 18 ... $\sigma$ ). The dashed line indicates the systemic velocity. If a V_pv has been derived, the resulting velocities at either side of the rotation curve are indicated by arrows. Middle panel: minor axis position-velocity diagram. Grayscales and contours are identical to the major axis position-velocity diagram. Right panel: global H I profile of the Hanning smoothed data cube.

$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA1.ps} \end{figure}$	Figure A.1: Summary panel for D500-2. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 5.09 mJy, which translates to a column density limit of $n_{\rm HI}=8.8\times10^{19}~{\rm cm}^{-2}$ .
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA2.ps} \end{figure}$	Figure A.2: Summary panel for D500-3. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 4.51 mJy, which translates to a column density limit of $n_{\rm HI}=5.2\times 10^{19}~{\rm cm}^{-2}$ .
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA3.ps} \end{figure}$	Figure A.3: Summary panel for D512-2. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 5.50 mJy, which translates to a column density limit of $n_{\rm HI}=3.3\times 10^{19}~{\rm cm}^{-2}$ .
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA4.ps} \end{figure}$	Figure A.4: Summary panel for D564-8. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 4.99 mJy, which translates to a column density limit of $n_{\rm HI}=4.9\times 10^{19}~{\rm cm}^{-2}$ .
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA5.ps} \end{figure}$

Figure A.5:

Summary panel for D572-5. A general description of the panels and levels is given at the beginning of the Appendix. Grayscales in the zeroth moment map run from a column density of $n_{\rm HI}=1\times 10^{19}~{\rm cm}^{-2}$ (white) to $n_{\rm HI}=8\times 10^{20}~{\rm cm}^{-2}$ (black). The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 12.47 mJy, which translates to a column density limit of $n_{\rm HI}=1.4\times 10^{19}~{\rm cm}^{-2}$ .

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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA6.ps} \end{figure}$	Figure A.6: Summary panel for D575-1. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 9.81 mJy, which translates to a column density limit of $n_{\rm HI}=1.3\times 10^{19}~{\rm cm}^{-2}$ . The contours in the second moment map are at 7.5 km s^-1 and 9 km s^-1.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA7.ps} \end{figure}$	Figure A.7: Summary panel for D575-2. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 5.58 mJy, which translates to a column density limit of $n_{\rm HI}=2.0\times 10^{19}\ {\rm cm}^{-2}$ .
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA8.ps} \end{figure}$	Figure A.8: Summary panel for D575-5. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 8.82 mJy, which translates to a column density limit of $n_{\rm HI}=0.6\times 10^{19}~{\rm cm}^{-2}$ . The contours in the second moment map are given at 6 km s^-1 and 7.5 km s^-1.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136fA9.ps} \end{figure}$	Figure A.9: Summary panel for D631-7. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 11.06 mJy, which translates to a column density limit of $n_{\rm HI}=3.7\times 10^{19}~{\rm cm}^{-2}$ .
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136A10.ps} \end{figure}$	Figure A.10: Summary panel for D640-13. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 11.49 mJy, which translates to a column density limit of $n_{\rm HI}=3.3\times 10^{19}~{\rm cm}^{-2}$ . The contours in the second moment map are given at 7.5 km s^-1 and 10 km s^-1.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136A11.ps} \end{figure}$	Figure A.11: Summary panel for D646-7. A general description of the panels and levels is given at the beginning of the Appendix. The $3\sigma$ contour in the zeroth moment map corresponds to a flux of 7.92 mJy, which translates to a column density limit of $n_{\rm HI}=0.7\times 10^{19}~{\rm cm}^{-2}$ . The contours in the second moment map are given at 7.5 km s^-1 and 9 km s^-1.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136A12.ps} \end{figure}$	Figure A.12: Channel maps of D500-2. Grayscales run from -0.02 to 7 mJy. Every second channel is shown.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136A13.ps} \end{figure}$	Figure A.13: Channel maps of D500-3. Grayscales run from -0.02 to 5 mJy. Every channel is shown.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136A14.ps} \end{figure}$	Figure A.14: Channel maps of D512-2. Grayscales run from -0.02 to 8 mJy. Every second channel is shown.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136A15.ps} \end{figure}$	Figure A.15: Channel maps of D564-8. Grayscales run from -0.02 to 7 mJy. Every channel is shown.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136A16.ps} \end{figure}$	Figure A.16: Channel maps of D575-2. Grayscales run from -0.02 to 10 mJy. Every fourth channel is shown.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{11136A17.ps} \end{figure}$	Figure A.17: Channel maps of D631-7. Grayscales run from -0.02 to 25 mJy. Every second channel is shown.
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