GRID_MGSR <- function(DAT,lag=0.25,x1=0,x2=0,y1=0,y2=0)
{
x.range <- (range(DAT[,1])) + c(x1,x2)
y.range <- (range(DAT[,2])) + c(y1,y2)
xygrid <- expand.grid(x=seq(from=x.range[1], to=x.range[2], by=lag),y=seq(from=y.range[1], to=y.range[2], by=lag))
}
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