Output:
	file 1 file 2 file 3	file 4 
AB	 1.0	4.0	4.0	4.0
AB-1	 2.0	6.0	6.0	6.0
AB-4	 1.0	9.0	9.0	9.0
AB-6	 2.0	8.0	4.0	4.0