You may consider the use of error bars.  I carried this trick over from 
Excel.  

1) Add another column to your chart in Advanced Edit, Recommendations, Data 
Range.  
2) Add a number to a cell in that column within your Y-axis range 
corresponding to the location of your vertical line. 
3) In Advanced Edit, Customization, Series, pick your newly created column. 
  You can add an error bar for the cell you chose in 2) by going to the 
Error Bars and selecting Constant from the Error Bar drop down menu.
4) Extend the error bar as high and low as you want.  You can fix the 
Y-Axis range if your error range raises or lowers the chart Y range.

I hope this helps!

On Wednesday, May 16, 2012 at 9:50:42 AM UTC-5, 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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