contourf: Draws filled contour and contour lines.
In tunelipt/wutils: Useful functions for data processing in a wind tunnel

Basically a combination of functions contour and filled.contour.

fidContour(x = seq(0, 1, length.out = nrow(z)), y = seq(0, 1, length.out =
  ncol(z)), z, xlim = range(x, finite = TRUE), ylim = range(y, finite =
  TRUE), zlim = range(z, finite = TRUE), levels = pretty(zlim, nlevels),
  nlevels = 20, color.palette = cm.colors,
  col = color.palette(length(levels) - 1), plot.title, plot.axes, key.title,
  key.axes, asp = NA, xaxs = "i", yaxs = "i", las = 1, axes = TRUE,
  frame.plot = axes, contour.lines = FALSE, nclevels = 10,
  clevels = pretty(zlim, nclevels), labels = NULL, vfont = NULL,
  labcex = 0.6, drawlabels = TRUE, method = "flattest",
  ccol = par("fg"), lty = par("lty"), lwd = par("lwd"), shapeFun = NULL,
  plot.key = TRUE, ...)

contourf(x = seq(0, 1, length.out = nrow(z)), y = seq(0, 1, length.out =
  ncol(z)), z, xlim = range(x, finite = TRUE), ylim = range(y, finite =
  TRUE), zlim = range(z, finite = TRUE), levels = pretty(zlim, nlevels),
  nlevels = 20, color.palette = cm.colors,
  col = color.palette(length(levels) - 1), plot.title, plot.axes, key.title,
  key.axes, asp = NA, xaxs = "i", yaxs = "i", las = 1, axes = TRUE,
  frame.plot = axes, contour.lines = TRUE, nclevels = 10,
  clevels = pretty(zlim, nclevels), labels = NULL, vfont = NULL,
  labcex = 0.6, drawlabels = TRUE, method = "flattest",
  ccol = par("fg"), lty = par("lty"), lwd = par("lwd"), shapeFun = NULL,
  plot.key = TRUE, ...)

`x, y`	locations of grid lines at which the values in ‘z’ are measured. These must be in ascending order. By default, equally spaced values from 0 to 1 are used. If ‘x’ is a ‘list’, its components ‘x$x’ and ‘x$y’ are used for ‘x’ and ‘y’, respectively. If the list has component ‘z’ this is used for ‘z’.
`z`	A matrix containing the values to be plotted (‘NA’s are allowed). Note that ‘x’ can be used instead of ‘z’ for convenience.
`xlim, ylim, zlim`	x-, y- and z-limits for the plot.
`levels`	a set of levels which are used to partition the range of ‘z’. Must be strictly increasing (and finite). Areas with ‘z’ values between consecutive levels are painted with the same color.
`nlevels`	if ‘levels’ is not specified, the range of ‘z’, values is divided into approximately this many levels.
`color.palette`	a color palette function to be used to assign colors in the plot.
`col`	an explicit set of colors to be used in the plot. This argument overrides any palette function specification. There should be one less color than levels
`plot.title`	statements which add titles to the main plot.
`plot.axes`	statements which draw axes (and a ‘box’) on the main plot. This overrides the default axes.
`key.title`	statements which add titles for the plot key.
`key.axes`	statements which draw axes on the plot key. This overrides the default axis.
`asp`	the y/x aspect ratio, see ‘plot.window’.
`xaxs`	the x axis style. The default is to use internal labeling.
`yaxs`	the y axis style. The default is to use internal labeling.
`las`	the style of labeling to be used. The default is to use horizontal labeling.
`axes, frame.plot`	logicals indicating if axes and a box should be drawn, as in ‘plot.default’.
`contour.lines`	Plot the contour lines?
`nclevels`	number of contour levels desired iff ‘levels’ is not supplied.
`clevels`	numeric vector of levels at which to draw contour lines.
`labels`	a vector giving the labels for the contour lines. If ‘NULL’ then the levels are used as labels, otherwise this is coerced by ‘as.character’.
`vfont`	if ‘NULL’, the current font family and face are used for the contour labels. If a character vector of length 2 then Hershey vector fonts are used for the contour labels. The first element of the vector selects a typeface and the second element selects a fontindex (see ‘text’ for more information). The default is ‘NULL’ on graphics devices with high-quality rotation of text and ‘c("sans serif", "plain")’ otherwise.
`labcex`	‘cex’ for contour labelling. This is an absolute size, not a multiple of ‘par("cex")’.
`drawlabels`	logical. Contours are labelled if ‘TRUE’.
`method`	character string specifying where the labels will be located. Possible values are ‘"simple"’, ‘"edge"’ and ‘"flattest"’ (the default). See the ‘Details’ section.
`ccol`	color for the lines drawn.
`lty`	line type for the lines drawn.
`lwd`	line width for the lines drawn.
`shapeFun`	Function that plots something on the canvas.
`add`	logical. If ‘TRUE’, add to a current plot.