R (>= 2.5.1), splus2R (>= 1.0-1), ifultools (>= 1.0-2), sapa, wmtsa, akima, MASS, scatterplot3d
R (>= 2.4.1), splus2R, ifultools, sapa, wmtsa, akima, MASS, scatterplot3d
sapa(>= 2.0-0), wmtsa (>= 2.0-0), scatterplot3d
sapa(>= 2.0-0), wmtsa (>= 2.0-0), MASS, methods, scatterplot3d