`\multicolumn{cols}{pos}{text}`
The `\multicolumn` is used to make an entry that spans several columns. The first mandatory argument, `cols`, specifies the number of columns to span. The second mandatory argument, `pos`, specifies the formatting of the entry; `c` for centred, `l` for flushleft, `r` for flushright. The third mandatory argument, `text`, specifies what text is to make up the entry.