Interferometric map obtained at 1.9 mm on 4 March 2012 with the Plateau de Bure interferometer. The map is centred at the expected position of the comet according to the identical ephemeris solutions JPL#77 and IMCCE (red cross). The trajectory of the comet around the observing time is indicated by the red line, the arrow indicates the direction of the motion. The tracked position given by JPL#75 is also indicated (pink cross). The emission peak with a S/N of 4.8 (see text) is indicated by the green cross. The arrow points to the direction to the Sun and the ellipse at the bottom left corner represents the synthesized beam. The contour spacing corresponds to the rms value of the signal (0.13 mJy) and the dotted contours represent negative values.