Hi Richard,

That was a perfect solution for what I was looking for. Its also worth 
noting that you can use this to do horizontal lines as well, or a 
crosshair, through adding a trend line instead of a error bar.


On Friday, 26 June 2015 04:04:12 UTC+12, Richard Hammitt wrote:
> 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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