macro graph highlighting some numbers
 

Hello guys,

I have the following issue. On a sheet I have a graph that is
generated without a macro, so the graph already exists. I need a macro
that highlights on the x-axe a value that meets a certain criteria
(let's say equal to cell a5) and that creates a dropline from the x-axe
to the graphvalue.

If it is easier to generate the graph with the same macro let us say
that the data for x runs from a1-a10 and for y from b1-b10

thanks