2 panels
-- 2 panels options: 18 x 9 in 2 panels of 9 x 9 18 x 10 in 2 panels of 9 x 10 20 x 11 in 2 panels of 10 x 11 20 x 11 in 2 panels of 10 x 11

3 panels
-- 3 panels options:

4 panels
-- 4 panels options: