2 panels
-- 2 panels options: 18 x 17 in 2 panels of 9 x 17 18 x 18 in 2 panels of 9 x 18 20 x 19 in 2 panels of 10 x 19 20 x 20 in 2 panels of 10 x 20

3 panels
-- 3 panels options:

4 panels
-- 4 panels options: