circ_funnel: Draw funnel over range of points
In markheckmann/circplot: Draw graphical elements in circular way

Draw funnel over range of points

1 2	circ_funnel(x, r = NULL, outer = TRUE, increasing = TRUE, probs = c(0, 1), ...)

`x`	Original data.
`r`	Radius for plot (optional). If not set the max of `circ_par("y.to")` is used as radius.
`outer`	Use outer radius for drawing? (default `TRUE`).
`increasing`	Draw from low to high x values.
`y`	Choose where the edge of the funnel is (scaled to `[0,1]`).