group_index	imputation_group	source	collection	presentable
1	aberdeen	D	slaughter	aberdeen_g1_D_slaughter
2	aberdeen	D	tube	aberdeen_g2_D_tube
3	aberdeen	L	slaughter	aberdeen_g3_L_slaughter
4	aberdeen	W	slaughter	aberdeen_g4_W_slaughter