This data frame is a contengency table with the athletism events (in row) and the coutries (in columns). Each cell gives the number of medals obtained during the 5 olympis games from 1992 to 2008 (Barcelona 1992, Atlanta 1996, Sydney 2000, Athens 2004, Beijing 2008).
A data frame with the 24 events in athletism and in colum the 58 countries who obtained at least on medal
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