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# Convert Longitudes to (-180,180)
# 'make180()' is an internal function that converts a vector of longitudes
# from (0,360) to (-180,180)
#
# lon - A vector of longitudes
# return - A vector of longitudes all mapped to (-180,180)
#
make180 <- function(lon) {
ind <- which(lon > 180)
lon[ind] <- lon[ind] - 360
return(lon)
}
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