appearance {+keepcolor shading smooth linewidth 4}
nSKEL 4
5 4

0 0 0 0
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1

2 0 1  1 0 0
2 0 2  0 1 0
2 0 3  0 0 1
2 0 4  1 1 1
