Based on observations with ISO, an ESA project with instruments funded by ESA member states (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.

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Maps obtained from the CVF data have not been rotated north-south because, at these wavelengths, the images are undersampled and a rotation would conserve neither the flux nor the spatial distribution. To make the comparison among data at other wavelengths easier, we have rotated the H $\alpha$ and the NIR images to the same ISOCAM orientation.

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