# NOT RUN {
geo_trianglegrid(c(-77.3876, 38.7198, -76.9482, 39.0277), 3, "miles")
geo_trianglegrid(c(-77.3876, 38.7198, -76.9482, 39.0277), 10, "miles")
geo_trianglegrid(c(-77.3876, 38.7198, -76.9482, 39.0277), 30, "miles")
# }
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