Data frames with coordinates x and y as columns
An object of class tbl_df (inherits from tbl, data.frame) with 200 rows and 2 columns.
An object of class tbl_df (inherits from tbl, data.frame) with 200 rows and 2 columns.
An object of class tbl_df (inherits from tbl, data.frame) with 200 rows and 2 columns.