2 panels
-- 2 panels options: 18 x 21 in 2 panels of 9 x 21 18 x 22 in 2 panels of 9 x 22 20 x 23 in 2 panels of 10 x 23 20 x 24 in 2 panels of 10 x 24

3 panels
-- 3 panels options:

4 panels
-- 4 panels options: