Group	Number_heads
Control	2
Control	3
Control	3
Control	3
Control	3
Control	3
Control	3
Control	3
Control	3
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	4
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	5
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	6
Control	7
Control	7
Control	7
Control	7
Control	7
Control	7
Control	8
Control	8
Control	9
Control	10
Control	10
Treatment	2
Treatment	2
Treatment	3
Treatment	3
Treatment	3
Treatment	3
Treatment	4
Treatment	4
Treatment	4
Treatment	4
Treatment	4
Treatment	4
Treatment	4
Treatment	4
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	5
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	6
Treatment	7
Treatment	7
Treatment	7
Treatment	7
Treatment	7
Treatment	7
Treatment	7
Treatment	8
Treatment	8
Treatment	8
Treatment	8
Treatment	8
Treatment	8
Treatment	10
Treatment	10
Treatment	10
Treatment	10
Treatment	10