plotting symbol at both ends of a periodic map
|Target version:||Candidate for next minor release|
For projections which plots a longitude twice (e.g., lon = 0 and lon = 360 for a global map), e.g.,
echo 0 0 | psxy -Rg -JH180/6i -P -B30g30 -Sc0.1i -Gred | gv -
should also show up on the right side of the map. This affects psxy and psxyz.