I will post down here the tableI need to create in LaTeX.
I actually have no clue with how to proceed. I only know basics tables codes.
Any help will be really appreciated!
P.s. I drew here a sample. I need actually more than three $\alpha$ cells and more than nine $t$ cells,but that won't be a problem of course: I will extend the code.
About the size: I would like for the table to be quite large.
Not a landscape mode, but let's say $18$ cm in length. The height will depend upon how many $t$ and $\alpha$ I will put inside!
Taking partly into account an odd number of grouped rows, here a way, with
multirow, array, captionand
siunitxfor the numbers alignment on the decimal dot in the last column.