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Fig. 1
Spectra from new sources. Spectra of previously published sources can be found in Klaassen & Wilson (2007) and Klaassen & Wilson (2008). The scale on the Y axis reflects the intensity of the HCO+ line(black). The H13CO+ (red) has been scaled up by a factor of four, and the SiO (green) has been scaled up by a factor of 16.
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