"plot"(x, title, subtitle, xlab, ylab, ylim, ...)
"plot"(x, title = NULL, subtitle = NULL, xlab = NULL, ylab = NULL, ylim = NULL, ...)
"plot"(x, title = NULL, subtitle = NULL, xlab = NULL, ylab = NULL, ylim = NULL, ...)
"plot"(x, title = NULL, subtitle = NULL, xlab = NULL, ylab = NULL, ylim = NULL, ...)