All Figures

Figure 1: Images of NGC 4565 and NGC 5907 from the Sloan Digital Sky Survey. The upper ones are the grey-scale version of the original picture without any change in the look-up table. The lower ones have been clipped at a shallow and a deep level (for more precise information see the text) and subsequently have been heavily smoothed. Although the images grow significantly toward fainter levels in the vertical direction, the change in the radial direction is much smaller.

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In the text

Figure 2: UGC 8550 shows no evidence for a truncation nor for a warped H I-layer. The H I is more extended than the optical disk. At the top the three images from the SDSS, produced as in Fig. 1. The lower panel shows the vertical position of the centroid of the gas-layer as determined from the distribution of the H I by García-Ruiz et al., on the same radial scale and with the aspect ratio restored to the real sky.

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In the text

	Figure 3: UGC 6283 shows no evidence for a truncation, but it has a warped H I-layer that sets in (projected onto the sky) at a radius larger than the optical radius. Further as in Fig. 2.
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In the text

	Figure 4: UGC 7774 has a truncation and a warped H I-layer that sets in (projected onto the sky) at about the truncation radius. Further as in Fig. 2.
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In the text

	Figure 5: UGC 6126 has a truncation and a warped H I-layer that sets in (projected onto the sky) well within the truncation radius. Further as in Fig. 2.
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In the text