The LaTeX extension nicematrix is distributed under the LPPL 1.3 license. This extension has been written by F. Pantigny (fpantigny@wanadoo.fr). This extension is entirely contained in a single file : nicematrix.sty The LaTeX package nicematrix provides new environments similar to the classical environments array and matrix but with some additional features. Among these features are the possibilities to fix the width of the columns, to draw continuous ellipsis dots between the cells of the array and to add an exterior line and an exterior column.