Oh, I forgot - you can use domain-axis annotations to do this.  See column 
roles <https://developers.google.com/chart/interactive/docs/roles> for 
details implementing these.

On Wednesday, May 16, 2012 1:47:19 PM UTC-4, asgallant wrote:
>
> No, there is no support for this in Line or Area charts.  If you use 
> scatter charts, you can make something that looks very similar to a line 
> chart, and you can put a vertical line in that.  I helped someone else here 
> do something similar in ScatterCharts: 
> https://groups.google.com/d/msg/google-visualization-api/ePW6i9pb0qE/TEkjMdHGXaEJ
> On Wednesday, May 16, 2012 10:50:42 AM UTC-4, Jim wrote:
>>
>> Is it possible to add a vertical marker for a line / area chart?  For 
>> example, say my x-axis range is 0-50 and I want to show a vertical 
>> line at 33.  Is that possible?  I couldn't find this in the 
>> documentation.
>
>

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