As it can be seen in the attached picture, I need to find an equation to fit this curve if I have only the data from the picture. Since this is a graphical method, I can't have a high accuracy but I need a generalized function that would give me the value for every point. As you can see, the values in Y-axis are not linear so I have no idea about the type of the function.
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If all you want is to create a function to use for other calculations then the methods Valery outlined are sufficient.
There is a program, "CurveExpert" that will take your tabulated X,Y data and present a list of functions and how well they fit (along with the least square coefficients that best fit your data.) This can be quite helpful if you need a function definition for some reason.