def lat(self):
        """Latitude of grid centers (degrees North)

        :getter:    Returns the points of axis ``'lat'`` if availible in the
                    process's domains.
        :type:      array
        :raises: :exc:`ValueError`
                    if no ``'lat'`` axis can be found.

        """
        try:
            for domname, dom in self.domains.items():
                try:
                    thislat = dom.axes['lat'].points
                except:
                    pass
            return thislat
        except:
            raise ValueError('Can\'t resolve a lat axis.')