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facet_form(horiz = NULL, horiz2 = NULL, vert = NULL, vert2 = NULL)
horiz
) and second (horiz2
) level of faceting in
the horizontal direction. E.g. "M" or "species". A value of NULL (default)
indicates no faceting.vert
) and second (vert2
) level of faceting in
the vertical direction. E.g. "M" or "species". A value of NULL (default)
indicates no faceting.facet_grid
, or NULL if all
arguments are NULL