obtained a 9 points map in (1-0) and (2-1) centered at the dust peak and spaced by 20.

Results {#sresults}
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Integrated intensity maps and continuum emission {#integrated}
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We show the observed map of the 1.2mm dust continuum in Fig.  \[fig1a\], and the map of integrated line intensity, obtained in the observed transitions of , , and , in Fig. \[fig1b\]. The reference position for these maps is (04:28:39.8, 26:51:35) in J2000 coordinates.

The bolometer map was reduced with the IRAM standard reduction program NIC. From Fig. \[fig1a\], we see that the observed emission has a “cometary” structure in the sense that the low level contours are well–fitted by an ellipse with the maximum offset from the center. We can fit the general elliptical structure of the core with a 2D-gaussian centered at offset (-30,20) with full width half–power dimensions of 274$\times$ 170and position angle 25. If the more extended emission is not included in the fit, the 2D–gaussian is centered on the dust peak position at (-10,0), has half–power dimensions of 127$\times \, 77 $, a position angle of 25 and an aspect ratio equal to 1.6. The peak intensity is 90 mJy/beam.

The spectral line data were 