df is a dataframe comprising 10 rows and 5 columns. The row names are '1', '2', ..., '10', in order, whereas the column names are 'A', B', ..., 'E', in order. The values in is a dataframe comprising 10 rows and 5 colu
阅读背景：
从数据框的列生成同一画布上的多个散点图
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