Distribution Depth specifies how far would you like to trace the funds sent out by the input wallet address. For example, a distribution depth of 3 will cause the graph to display the outgoing transactions, starting with the input wallet address, up to 3 hops away.
The source depth is nearly identical to the distribution depth, except that it is for incoming transactions instead of outgoing ones.
The picture above shows how a graph with a source and distribution depth of "1" would look like.
The picture above shows how a graph with a source and distribution depth of "2" would look like instead.
For better speed and a graph output that is readable, please try to keep your depths to 5 and below if possible.