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I have a problem. My data is now in this form: plot area d 1 0.01 34.6 ................... 100 0.01 15.7 First, I want to aggregate plots start from a plot in the center of sample (10 plots x 10 plots). I want to aggregate after the model plot1 in the center of area (0,01 m2), after increasing plot area with the near plots until the entire area (10000 m2). For a good explication I will