Once you extract all you can then just pick the points you like to use. 

On 28 Feb 2017, at 17:20, <youchamianshidai@sina.com> <youchamianshidai@sina.com> wrote:

Dear All: 
            I have a problem with my calculations. I want to extract the density data of the same point in several periods, but I don't know how to solve it. I can only extract the data of all grid points. If anyone knows, I hope you can tell me. I would be very grateful!
                                                                                                                                                           Best wishes


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