How to find a minimum in a double peaked graph?

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M G
M G 2013-11-5
Hey all,
Please plot the data below. You can see that there is a graph with double peaks around 100 and 200. I want to find the minimum between these peaks. The problem is not only for this peak and I have a write a code which automatically finds the valley. How can I make a general code? In this graph I want the X=139 which is the min between two peaks. The mat file is uploaded here:
https://dl.dropboxusercontent.com/u/19202474/data.rar
Thanks in advance:) https://dl.dropboxusercontent.com/u/19202474/data.rar

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