Nothing
plot.stft <- function (x, col = gray (63:0/63), ...)
{
x <- x$values
image(x=1:dim(x)[1], y=1:dim(x)[2], z=x, col=col, ...)
}
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.