Use different colors for multiple edges / heat map and single edge in adjacency matrix.

[alexsb]

We should use different colors for cases where a row represents an aggregate, and where it represents a single node:

We actually do that already for the hidden edge matrix.

[cnobre]

are we still doing this or are we only using different colors for different types?

[alexsb]

good question, these are in conflict. maybe have a slight background color for the type, gray cells for single edges, and another color for aggregates?

[cnobre]

will try it out.

[cnobre]

check.