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g <- graticule(60, 30, crs="+proj=robin")
plot(g, background="azure", col="red", lty=2, box=TRUE)
plot(g, background="azure", col="light gray", lab.loc=c(1,2),
lab.lon=c(2,4,6), lab.lat=3:5, lty=3, retro=TRUE)
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