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Fig. 1.
Colour-composite images of the barred galaxies NGC 2903, NGC 3351, NGC 4579, and NGC 4725. The RGB images are created by assigning red (Spitzer 3.6 μ), green (SDSS r band) and blue (SDSS u band) colours to the images. All images have the same orientation; the north-east direction arrows are laid on the image of NGC 3351.
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