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...ach panel in a lattice > (or Trellis), e.g., of levelplot's? Note I am not inquiring about > creating choropleth maps[,] which Sarkar 2008 covers quite well (and which is supported by latticeExtra::mapplot): I just want to appropriately overlay a garden-variety boundary-line map on panel viewspaces defined by longitude and latitude. A relatively small, quite self-contained example follows the quote above, in which I plot toy data in the sort of lattice layout I need ... except that each panel lacks a map appropriate to the spatial domain. If your competencies extend to that, your assistanc...