Hi, all
I recently have a problem about Chinese map drawing. The original code as
follows:

library(maps)
library(mapdata)
map('china')

This is a China map with provincial boundaries. First, how to change the
boundaries into dashed lines? Second, how to combine two regions (like Xin
Jiang and Tibet) together and create a new bold boundary of this new region
combined by Xin Jiang and Tibet?

Cheers,
Guocheng

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