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tm_xlab(text, size = 0.8, rotation = 0)
tm_ylab(text, size = 0.8, rotation = 90)
data(World)
qtm(World, fill="#FFF8DC", projection="longlat", inner.margins=0) +
tm_grid(x = seq(-180, 180, by=20), y=seq(-90,90,by=10), col = "gray70") +
tm_xlab("Longitude") +
tm_ylab("Latitude")
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