a) The maps show the velocity-field of the single-dish maps of H13CO+, which is obtained by a single Gaussian fit. Dashed circles show the primary beam size of the PdBI. Dashed lines show the axis of the velocity gradient, while the arrows indicate the position angle of the gradient. The error of the gradient fitting is shown in the lower corners of the images. b) The maps show the peak velocity of the PdBI+30 m H13CO+ spectra. c) Position-velocity cuts of the single-dish H13CO+ spectra-cubes along the velocity gradient derived in Sect. 4.2.1 and indicated on a). Contour levels go from 20% of the peak intensity by 20% levels. Dashed lines indicate the systemic velocity. d) IRAM 30 m+PdBI position velocity cuts along the same direction. Contour levels indicate 20% of the peak emission as well and increase by 20% for CygX-N3, -N53, -N63, while contours start at 50% of the peak for CygX-N12, -N48.
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