Table 2 Sensitivity analysis of how the significance of the relationship between migration lag and seed weight changes when we alter the breadth of the northern and southern strips from the default value of 0.05 in our direct approach. We use these two strips to specify which trees have an extreme distribution. A narrow strip could limit the analysis to a few individuals whereas a wide strip may include trees which grow under less adverse growth conditions. The values are proportions of the total (latitudinal) distribution range. We only used strip breadth values exceeding 0.05 in this sensitivity analysis because we had very little statistical power in smaller strip breadth

From: Seed mass predicts migration lag of European trees