Water circulation

by anonymous at 2008-12-22_11:12:44
Ctrl+G - New Graph Ctrl+D - Derivative
node[shape=circle];
1->2;
1->3;
2->4;
2->5;
3->6;
3->7;
4->8;
4->9;
5->10;
5->11;
6->12;
6->13;
7->14;
7->15;