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The plus operator allows you to stack tmap-elements, and groups of tmap-elements.
tmap-elements
# S3 method for tmap +(e1, e2)
first tmap-element
tmap-element
second tmap-element
Tennekes, M., 2018, tmap: Thematic Maps in R, Journal of Statistical Software, 84(6), 1-39, 10.18637/jss.v084.i06
tmap-element and vignette("tmap-getstarted")
vignette("tmap-getstarted")