Usage
seriesPlot(x, col = "steelblue", main = x@units, ...)
histPlot(x, col = "steelblue", main = x@units, add.fit = TRUE, ...)
densityPlot(x, col = "steelblue", main = x@units, add.fit = TRUE, ...)
quantilePlot(x, col = "steelblue", main = x@units, labels = TRUE, ...)