Left: same as Fig. 3 for IRAS 19422+3506. All channels with a S/N> 15 are plotted. Positional uncertainties for the individuals spots range from ~2 mas to ~30 mas for the strongest and weakest plotted masers, respectively. No average offset is detected between the red- and blue-shifted masers. Right: similar to the left but only spots with S/N> 50 are plotted to highlight the northwest extension of the red-shifted masers. Individual errors range from ~2 mas to ~10 mas.