2 panels
-- 2 panels options: 18 x 11 in 2 panels of 9 x 11 18 x 12 in 2 panels of 9 x 12 20 x 13 in 2 panels of 10 x 13 20 x 13 in 2 panels of 10 x 13

3 panels
-- 3 panels options:

4 panels
-- 4 panels options: