

   GGeett DDoommaaiinn ffoorr SSppaattiiaall PPooiinntt PPaatttteerrnn AAnnaallyysseess

        ppgetregion()

   DDeessccrriippttiioonn::

        Retrieves the current rectangular domain `(xl, xu)'  x
        `(yl, yu)'.

   VVaalluuee::

        A named vector with components `xl', `xu', `yl, `yu'.

   SSeeee AAllssoo::

        `ppregion'

