& 0.052\
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Between January 2003 and March 2003, we obtained continuum data at 1.2mm together with observations of  and (1–0) and (2–1). These data were taken in service mode by the IRAM staff.

The continuum data were obtained using MAMBO II, the 117-channels bolometer available at the 30m. We mapped the core within an area of 150$\times$150  scanning in azimuth with a 5/sec speed and an interval between the subscans of 8. The atmospheric attenuation was measured to be $0.14$ based on tipping curves measured after the map. The data were calibrated using the sources HL Tau and L1551 for which we assumed fluxes of 0.9 Jy and 1.4 Jy respectively and the final sensitivity was 5 mJy per 10.5 beam. The calibration error inherent in this comparison is likely to be at least ten percent due to both atmospheric fluctuations and calibration errors.

The  data were taken using the on–the–fly technique. We simultaneously mapped the (1-0) and (2-1) using both polarizations for each line. The area covered was 150$\times$150  and was scanned in the Right Ascension direction; the distance between the subscans was 5 as was the angular separation between two successive dumps. We also 