Fig. 5
(Bottom left) SiO integrated intensity vs. H13CO+ FWHM and distance. Black symbols in this plot show SiO nondetections, red points indicate detections. The triangles (▴) indicate HMPOs, the filled squares (■) indicate HCHII regions, and the filled stars (★) indicate UCHII regions. The top panels show these two quantities as a function of source distance. The bottom righthand panel shows the SiO integrated intensity vs. H13CO+ FWHM corrected for the size-linewidth relationship.
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