plot station data and adding polygon from shape file

Dear NCL users, The attached files are  NCL script and its plot (I didn't attach data file since it is too big). My questions are as: question 1: How to plot the station data by extrapolation so the plot could cover the whole target region? question 2: The boundary is another shape file, how to change the "boundary line" ( lnres@gsLineThicknessF = 2.0), make it different from the line inside target region.  question 3: I also want to display the mark points, how to bring the mark to the front. Thanks very much! Mark

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• application/octet-stream attachment: station_plot.ncl