Although the tables are presented in chronological order by default, each table can be re-arranged in alphabetical order for any column by the reader clicking on the arrows at the top of that column. For illustration, to re-order a table by subject—e.g., to group together articles that pertain to "General relativity" or "Specific heats"—one need only click on the arrows in the "Classification and Notes" columns. To print out the re-sorted table, one may print it directly by using the web-browser Print option; the "Printable version" link at the left gives only the default sorting.