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Google API scatterchart: multiple tooltip hover


I have displayed a chart in a visualforce page using Google API Scatter Chart. In that, I have a functionality wherein a single data is represented by a dot on a  X-Y graph and its corresponding values are shown in tooltip (on hover on that dot).

Now I have problem wherein more than one data have same value (i.e more than one data lie on the same x-y coordinate). So in tooltip details of one data is displayed.

How can I display the details of all the datas in tooltip (of all those dots which have the same X-Y coordinates)

Please reply.....
Do let me know if some further information is required.
Points are overlapping and I have to remove overlapping.... Anybody any idea????