Comparison of the position angle PA_c of the vectorgoing from the continuum peak to the channel count peak (black plus symbol) and the position angles of the blueshifted (blue cross) and redshifted (red cross) outflow lobes for the sources listed in Table 3, except for L1448-NB2 which lacks outflow information. The black plus symbol is enclosed by a circle when the angular separation between the continuum peak and the channel count peak is larger than one-fifth of the beam. For the other ones, PA_c may not be reliable.