Scaling for the non-contiguous cartogram (mapType cartogram). area: each region is scaled relative to its own area. olson: the densest region keeps its size and every other shrinks proportionally (classic Olson)
Map distortion. region: a normal map (default). The other three are cartograms driven by sizeBy: dorling draws one non-overlapping circle per region sized by value; cartogram keeps each region shape and scales it about its own centre (non-contiguous); contiguous deforms the borders so regions stay joined while their areas match the value (Dougenik rubber-sheet)
Flag to show/hide the region labels on maps (only labels that fit inside their region without overlapping another label are drawn, largest regions first)