R language ggplot2 visualization: visualize the scatter diagram, add text labels to some data points in the scatter diagram, and use geom of ggrep package_ text_ The repl function avoids overlapping l

R Language ggplot2 visualization ： Visualize the scatter diagram and add text labels to some data points in the scatter diagram 、 Use ggrepel Bag geom_text_repel Function to avoid overlapping labels between data points （ Add segments to data point labels 、 Specify the angle of the line segment and the type of line ）

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