\\multicolumn{cols}{pos}{text} col, specifies the number of columns to span. pos specifies the formatting of the entry: c for centered, l for flushleft, r for flushright. text specifies what text is to make up the entry.
\\ multicolumn{ cols} {pos} {text} cols, especifica el nombre de columnes a crear. pos especifica el format de l' entrada: c per centrat, l per alineat a l' esquerra, i r per alineat a la dreta. text especifica quin text formarà l' entrada.