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High spatial resolution images of PNe have shown their extremely complexmorphology. However, the circumstellar envelopes of their progenitors, the AGBstars, are strikingly spherical. In order to understand the carving processesleading to axisymmetric nebulae, we are carrying out a study of a large sampleof pre-PNe. Our emission model of the nebular molecular gas (12CO & 13CO) willallow us to determine important physical parameters (mass, linear momentum,kinetic energy) of the fast bipolar and slow spherical nebular componentsseparately. We will study in an innovative way the properties for each sourceindividually, and put our results in an evolutionary context with the help ofthe data obtained by us and collected from the literature.

Deep study of the fast bipolar outflows in pre-PNe from CO mm-wave line emission