$\begin{figure}\resizebox{8.0cm}{!}{\includegraphics{1728fa1.eps}} \hfill \par \end{figure}$

Figure A1: NGC 2549: B-R isochromes and B isophotes from CFHT frames. Isochromes 1.60-1.675 (0.025). Isophotes 17-20 (0.5). N at 8 o'clock. There is a low contrast dust pattern, with the peak red colour somewhat displaced from the galaxian center, and a thin lane along part of the 19.5 isophote (see also Fig. 6)

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Figure A2: NGC 3098: B-R isochromes and B isophotes from CFHT frames. Isochromes 1.475-1.55 (0.025). Isophotes 17-20 (0.5). N at 9 30 o'clock. The colour distribution is rather flat, except for a modest central red peak, and evidence for the bluer disk at the SE majA. (see also Fig. 4). Poor B-V, V-I colour profiles

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Figure A3: NGC 3115: B-R isochromes and B isophotes from CFHT frames. Isochromes 1.55-1.675 (0.025). Isophotes 16-19 (0.5). N at 9 o'clock. The innermost "decoupled disk", first noted by Nieto et al. (1991), is very red, possibly due to dust concentration there. Poor V-I colour profile

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Figure A4: NGC 3245: B-R isochromes and B isophotes from CFHT frames. Isochromes 1.50-1.70 (0.025). Isophotes 17-20 (0.5). N at 7 30 o'clock. This object shows a high contrast central dust pattern. Note that the sharp feature 1.2 arcsec N from center is bluer than its surroundings

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Figure A5: NGC 4026: B-R isochromes and B isophotes from TBL frames. Isochromes 1.50-1.62 (0.04). Isophotes 18-21.5 (0.5). N at the top. There is an inner thin red disk. This galaxy features the minA asymmetry in light and colour, the E side being redder and less bright (see also Fig. 5)

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Figure A6: NGC 4036: B-R isochromes and B isophotes from TBL frames. Isochromes 1.50-1.80 (0.05). Isophotes 18-21 (0.5). N at the top. This galaxy features a prominent dust pattern nearly parallel to the majA on the S side. The minA asymmetry extends very far, with the S side redder and less bright

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Figure A7: NGC 4111: B-R isochromes and B isophotes from TBL frames. Isochromes 1.40-1.70 (0.05). Isophotes 17-20 (0.5). N at the top. This object displays a sharp central red peak, probably due to dust, with extensions along both the majA and the minA. The minA dust extension and the peanut bulge already noted by Tsikoudi (1972), seem to have correlated geometries

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Figure A8: NGC 4350: B-R isochromes and B isophotes from OHP frames. Isochromes 1.55-1.625 (0.025). Isophotes 17.5-21.5 (0.5). N at the top. The isochromes are flatter and somewhat displaced along the minA, which may be evidence for dust concentration in the disk

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Figure A9: NGC 5308: B-R isochromes and B isophotes from TBL frames. Isochromes 1.50-1.675 (0.025. Isophotes 18-21 (0.5). N at the top. There is a strong reddening of the inner disk, which might be taken as evidence of dust concentration there. The effect is however much smaller in V-I (see also Fig. 3 and Table 10)

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Figure A10: NGC 5422: V-I isochromes anf V isophotes from TBL frames. Isochromes 1.225-1.375 (0.025). Isophotes 16.5-21 (0.5). N at the top. There is a prominent dust pattern along the majA. This object displays the minA asymmetry in light and colour, the E side being redder and less bright. The colour feature at the SE corner of the field is due to a poorly erased field object

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Figure A11: NGC 7332: B-R isochromes and B isophotes from TBL frames. Isochromes 1.475-1.575 (0.025). Isophotes 17-21 (0.5). N at the top. There is an extended dust pattern of modest contrast, extending mostly in the minA direction

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Figure A12: NGC 7457: B-R isochromes and B isophotes from CFHT frames. Isochromes 1.525-1.60 (0.025). Isophotes 17-19 (0.5). N at 9 o'clock. The colour distribution is quite flat except for a small central red peak

7 Appendix