By opening T.Var1{1,1} (selected in the figure above) we get a double with 3 columns:
My intention is to have a table T without cells. I want to have a table T with 3 columns (no cells) where all the 5 contents of cells are concatenated vertically. (i.e., the cell 2, 3 columns, are in the end of cell 1, 3 columns, etc).