I think what you did in the file I tested is fine, where each is it's own object. However, I can't really say as I don't know what the actual final objects are supposed to look like, so that's only something you will be able to answer yourself once you tweak the hi/low values to the scale you want.
-- You received this message because you are subscribed to the Google Groups "Google Visualization API" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-visualization-api+unsubscr...@googlegroups.com. To post to this group, send email to google-visualization-api@googlegroups.com. Visit this group at http://groups.google.com/group/google-visualization-api. For more options, visit https://groups.google.com/d/optout.