#S 1 set from tmp1.dat
#N 2
#L x  y
0 3
1 4 
2 11
3 30
4 57
5 48
6 39
7 46
8 15
9 32
10 3
#S 2 set from tmp2.dat
#N 2
#L x  y
7 3.0
8 4.0
9 11.0
10 30.0
11 57.0
12 48.0
13 39.0
14 46.0
15 15.0
16 32.0
17 3.0