Map of northwest Mexico obtained from GSHHG database (v2.3.7).
This intermediate resolution map was imported from the Global Self-consistent, Hierarchical, High-resolution Geography Database by means of
Rgshhs function from maptools package.
Wessel, P. and Smith, W. H. F. 1996 A Global Self-consistent, Hierarchical, High-resolution Shoreline Database, Journal of Geophysical Research, 101, 8741–8743.
library(sp) data(dmap) plot(dmap, xlim=c(-120, -105) , ylim=c(20, 35), xaxs="i", yaxs="i", axes=TRUE, col="beige", lty=1, border="grey70"); box()
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