Labeled coords and dims in hierarchical group setting with different sizes

Questions v5
11
exp_idx participant a b a_obs b_obs level_scaled nr_o nr_trials
0 1 1 10.575617 1.609765 10.575617 1.609765 -0.5 6 35
1 1 1 10.575617 1.609765 10.575617 1.609765 0.0 18 36
2 1 1 10.575617 1.609765 10.575617 1.609765 0.5 25 36
3 1 1 10.575617 2.073440 10.575617 1.609765 -1.0 3 36
4 1 1 10.575617 2.073440 10.575617 1.609765 -0.5 1 36