public FcgLevel getLargestLevel(FcgDirection direction) {

		FcgLevel greatest = new FcgLevel(1, direction);

		Set<FcgLevel> keys = verticesByLevel.keySet();
		for (FcgLevel level : keys) {
			if (level.getDirection() != direction) {
				continue;
			}

			if (level.getRow() > greatest.getRow()) {
				greatest = level;
			}
		}

		return greatest;
	}
Returns the largest level (the furthest level from the source node) in the given 
direction 

@param direction the direction to search
@return the largest level
Ghidra/Features/GraphFunctionCalls/src/main/java/functioncalls/graph/FunctionCallGraph.java