2 panels
-- 2 panels options: 18 x 14 in 2 panels of 9 x 14 18 x 15 in 2 panels of 9 x 15 20 x 16 in 2 panels of 10 x 16 20 x 17 in 2 panels of 10 x 17

3 panels
-- 3 panels options:

4 panels
-- 4 panels options: