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    -------- Graphing functions --------

    histo       : Plot a histogram
    pairs       : Pairwise scatter plots of the columns of x
    pairs_d     : demo of pairs (pairwise scatterplots)
    plt_turns   : plot turning points in a time series
    plt_turnsd  : demo of fturns()
    pltdens     : Draw a nonparametric density estimate.
    pltdens_d   : demo of pltdens (non-parameter density plot)
    tsplot      : time-series plot with dates and labels
    tsplot_d    : demo of tsplot (time-series plot)