`plot' method for class "correlog".
# S3 method for correlog
plot(x, ...)an object of class "correlog", usually, as a result of a call to correlog or correlog.nc.
other arguments
A spatial or Mantel (cross-correlogram) is plotted.
If a permutation test was performed, values significant at a nominal (two-sided) 5%-level will be represented by filled circles and non-significant values by open circles.