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Generic for extractign the 'x values' from an object.
xvals(obj, ...)
an object of class spatialAtRisk
additional arguments
the xvals method
yvals, zvals, xvals.default, yvals.default, zvals.default, xvals.fromXYZ, yvals.fromXYZ, zvals.fromXYZ, xvals.SpatialGridDataFrame, yvals.SpatialGridDataFrame, zvals.SpatialGridDataFrame