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 UK) with the participation of ISAS and NASA.

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We use the standard definition of $L_{\rm IR}(8{-}1000~\mu{\rm m}) = 5.62\times10^5~D^2_{\rm Mpc}~(13.48f_{12} + 5.16f_{25} + 2.58f_{60} + f_{100})~L_{\hbox{$\odot$ }}$ (see Sanders & Mirabel 1996).

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... CAM Interactive Software (CIA)

The ISOCAM data presented in this paper were analyzed using "CIA'', a joint development by the ESA Astrophysics Division and the ISOCAM Consortium led by the ISOCAM PI, C. Cesarsky, Direction des Sciences de la Matière, CEA, France.

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... $\geq$ 0.55

We must be careful considering [Ne III] in source C $^\prime$ . We notice that the emission in this line is only marginally mapped at the C $^\prime$ position (see Fig. 5). Because C and C $^\prime$ are separated only by $5^{\prime\prime}$ , the feature we observe in the C $^\prime$ spectrum may be a relic of the extended wings of the PSF ( ${\it FWHM} \sim 4.5^{\prime\prime}$ ) centered on source C.

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