According to this reference 
http://code.google.com/apis/chart/interactive/docs/gallery/linechart.html
, tooltip.trigger = 'none' turns off tooltips on a chart.

How do you use this? data.tooltips.trigger = 'none'?

And, how do you turn off tooltips for a single column?

I am creating a linechart using
<script type="text/javascript" src="https://www.google.com/jsapi";></
script>
<script type="text/javascript">
    google.load("visualization", "1", {packages:["corechart"]});

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