Finding X value at some Y value

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Mon, 05/16/2011 - 05:16 am

Hello everybody,

I am writing a code for a program to extract certain data from the graph, which changes everytime depending on the data provided.
Right now I am trying to extract an X-axis value from the graph, intercepting the value=10e-7 at the Y-axis.

This value "10e-7", can be at any Y-axis point.

Any ideas???