What form of natural selection is shown in this graph?

To accurately identify the form of natural selection depicted in the graph, I would need to see the graph itself. However, common forms of natural selection include stabilizing selection, directional selection, and disruptive selection. Each of these affects population traits in different ways: stabilizing selection favors average traits, directional selection favors one extreme, and disruptive selection favors both extremes. Please provide more details or describe the graph for a specific analysis.