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This layers adds coordinate contours to smooth effect plots. It is mainly useful for smooth-on-the-sphere plots.
l_coordContour(brLO = c(-9:9 * 20), brLA = c(-8:8 * 10), ...)
An object of class gamLayer.
gamLayer
a vector of meridians to be plotted.
a vector of parallels to be plotted.
graphical arguments to be passed to ggplot2::geom_contour.
ggplot2::geom_contour
See plot.sos.smooth for examples.