Movable slider bars/crosshairs on graphic.

I have a chart which is an imported graphic with a log scale. I want users to be able to slide the bars (named 1 and 2) to ascertain the value from the chart. I want to restrict the slide action to vertical and horizontal if possible. I have been trying to think laterally i.e. underlaying another graph to allow crosshairs to appear, but this hasn't yielded any real bouts of inspiration. Another thought was activating the shift key on the worksheet getting focus so you can only go vert and hor'. See attached file.
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Rob HensonFinance AnalystCommented:
With your suggestion of an overlayed graph, maybe you could have two sets of toggle buttons which will increase/decrease the value of two variables. These variables would then be shown as the vertical and horizontal lines on the chart.

If you know what the correlation is between the two values, maybe the required value can then be calculated rather than extracted from the chart.
Rob HensonFinance AnalystCommented:
See attached.

The toggle buttons affect the values in cells C21 and J37. You can then use those values as a fixed value for a chart with two lines.

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vipamanAuthor Commented:
Thanks Rob. I wasn't sure where you were going initially and then I added some values in to compliment what you were saying and also made the graph transparent with a log scale. scaled graph to fit. See attached file.
vipamanAuthor Commented:
A lot of people said it couldn't be done. Thanks Rob
Rob HensonFinance AnalystCommented:
Glad to help.
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