5 Full version of Figure 1

 

Figure 1: The locations of H$_{\rm 2}$O masers are indicated by circles and OH masers by crosses. The corresponding grayed symbols represent the mean position of the maser spots for that species and do not necessarily correspond to an actual maser position. The position of the peak of the 23 GHz continuum emission is indicated by a star symbol if detected. The synthesized beams are shown next to the source name. The beams (OH cross-hatched) have the correct position angle and aspect ratio, but are not to scale. Linear scale bars are given for both near and far distances (if ambiguous) with the preferred distance located nearest the spot map. OH and H$_{\rm 2}$O spectra are displayed below the maps. See the text for an explanation of the items listed below the spectra

 

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Acknowledgements

We gratefully acknowledge the help of Shane Ebersole in preparing the figures for publication.