panel.levelcontourplot(x, y, z, subscripts = 1, at, shrink, labels = TRUE,
label.style = c("mixed", "flat", "align"), contour = FALSE,
region = TRUE, col = add.line$col, lty = add.line$lty,
lwd = add.line$lwd, border = "transparent", ...,
col.regions = regions$col, filled = TRUE, alpha.regions = regions$alpha)
topo.colors
by default) for generating such