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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Present address: Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK.

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... $\hbox{$^{\prime\prime}$ }$

Please note that all coordinates given are J2000.0.

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... aperture

A $15\hbox{$^{\prime\prime}$ }\times15\hbox{$^{\prime\prime}$ }$ ( $5\times5$ pixel) aperture was used for the 3 $\hbox{$^{\prime\prime}$ }$ pfov frames of field Ser A.

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...

Table 1 is only available in electronic form at http://www.edpsciences.org

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... spectra

These partial spectra were the result of various observational problems, such as sources lying near to the edge of the frame or lying on the bad column.

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...

Table 2 is only available in electronic form at http://www.edpsciences.org

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... here

Figures A.1-A.7 are only available in electronic form at http://www.edpsciences.org

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