def plot(plot, x, y, **kwargs):
    """
    Adds series to plot. By default this is displayed as continuous line.
    Refer to matplotlib.pyplot.plot() help for more info. X and y coordinates
    are expected to be in user's data units.
    
    Args:
        plot: matplotlib.pyplot
            Plot to which series should be added.
        
        x: (float,)
            Collection of x-coordinates in user units.
        
        y: (float,)
            Collection of y-coordinates in user units.
        
        title: str
            Series legend.
    """
    
    # add series
    return plot.plot(x, y, **kwargs)