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How to read exactly the value of impedance from the plotting of Gmin vs frequency?

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anhnha

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Hi.

I am plotting Gmin ( optimum noise reflection coefficient) of a LNA in Smith chart.
I swept Gmin versus frequency (for example, ranging from 1GHz to 3GHz).

Is there a way to read out optimum noise impedance at my interested frequency, say 2GHz, from the curve?
I know that I can point the cursor over the curve, find the interested frequency and then read out the impedance. However, that method is not exactly at all.

103260d1395000657-gmin-vs-frequency.png
 

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