`plot' method for class "Sncf.cov".
# S3 method for Sncf.cov
plot(x, xmax = 0, ...)an object of class "Sncf.cov", usually, as a result of a call to Sncf.srf (with corr = FALSE).
the maximal distance to be plotted on the x-axis. If set to zero the maximum distance in the data will be used.
other arguments
A plot of the nonparametric spatial covariance function (with CI's if boostrapps are available)