panel.levelcontourplot(x, y, z, subscripts, at, shrink,
labels = FALSE,
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