Using the image chart API you can add dynamic icons as described here:
http://code.google.com/apis/chart/image/docs/gallery/dynamic_icons.html

Is it possible to do similar using the visualization area chart?

e.g. if I have an area chart plotting quantity sold on the y-axis and
dates on the x-axis, I might want to mark the date that an advertising
campaign started to highlight any effect on sales.

Is it possible to place additional markers on a visualization api area
chart?

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