For kde.loctest objects, the function headers are
## univariate
plot(x, lcol, col, add=FALSE, xlab="x", ylab, rugsize, add.legend=TRUE,
pos.legend="topright", ...)
## bivariate
plot(x, col, add=FALSE, xlab="x", ylab="y", add.contour=FALSE,
add.legend=TRUE, pos.legend="topright", ...) ## trivariate
plot(x, col, add=FALSE, xlab="x", ylab="y", zlab="z", box=TRUE, axes=TRUE,
alphavec=c(0.5, 0.5), ...)