private boolean hasExternalEntryPoint(Address[] startAddrs) {
		SymbolTable symbolTable = program.getSymbolTable();
		for (Address address : startAddrs) {
			if (symbolTable.isExternalEntryPoint(address)) {
				return true;
			}
		}
		return false;
	}
Set the maximum number of code lines which will be used per block when
showCode is enabled.
@param maxLines maximum number of code lines
Ghidra/Features/ProgramGraph/src/main/java/ghidra/graph/program/BlockGraphTask.java