The world map images in this group have totally transparent areas, only the borders have solid black color.
Code of the map: b1a
Land color: transparent
Water color: transparent
Outline thickness: thin
Code of the map: b1c
Land color: transparent
Water color: transparent
Outline thickness: thick
Code of the map: b1b
Land color: transparent
Water color: transparent
Outline thickness: medium
Code of the map: b4a
Land color: transparent
Water color: transparent
Outline thickness: thin