I must be honest, I have no clue what that is showing.
Different combinations of unified Germany, from the looks of it.
After a quick google, the
Doppelbund would have involved a unified small Germany, which was confederated with Austria.
This is the
Greater Austria plan. It would have involved expanding the German Confederation to include all of the Austrian Empire.
I assume Red indicates what is in the planned Germany, with other colours indicating other states - pale yellow being Austria, for instance. Multiple colours, I assume, indicate a more confederal Germany.