importFrom(graphics, polygon)
importFrom(grDevices, contourLines)
importFrom(KernSmooth, dpik, bkde2D)
importFrom(MASS, bandwidth.nrd, kde2d)
importFrom(sp, over, Polygon, Polygons, SpatialPoints, SpatialPolygons)

export(conf2d, conf2d.default, conf2d.formula, conf2d_int,
       freq2d, freq2d.default, freq2d.formula)

S3method(conf2d, default)
S3method(conf2d, formula)
S3method(freq2d, default)
S3method(freq2d, formula)
