Notes.For the collimated outflows, the expected values of the PA of the outflow axis and flow semi-opening angle, Δθ, are indicated with boldface characters. Column 1 reports the target name; Col. 2 marks the YSO flow structure as collimated (C) or undetermined (U), reporting also the kind of observational evidence used to define the collimated outflows (see Sect. 6.2): “m” for water masers, “r” for radio continuum, and “m+r” for maser plus radio continuum; Cols. 3–6 list the PA of the major axis of the maser spatial distribution, the dispersions along the major and minor axes, and their relative ratio, respectively; Cols. 7 and 8 give the PA of the average proper motion direction and the average separation of the measured proper motions from this direction, respectively; Col. 9 reports the average value (and the standard deviation) of the maser projected distance from the YSO; Cols. 10 and 11 list, respectively, the PA of the radio continuum (determined at the frequency where it is more elongated), and, for the source G016.58−0.05 associated with an extended ionized jet, the angular scatter of the masers about the jet axis (evaluated from the YSO position); Col. 12 shows the momentum rate derived for the collimated outflows.