R language plot visualization: plot to visualize the two-dimensional histogram contour map, add numerical labels on the contour lines, customize the label font color, and set the mouse hover display e

R Language plotly visualization ：plotly Visual 2D histogram contour map 、 Add value labels on contour lines 、 Custom label font color 、 Set the mouse hover display effect （Styled 2D Histogram Contour）

 

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