Split-Orientation
This property sets or retrieve the split orientation.
Possible values are:
0
Horizontal split with vertical divider bar (default)
1
Vertical split with horizontal divider bar
Example - Define a split pane with vertical split
screen section.
...
  03 screen-1-sp-2 Split-pane
     line 39.1
     column 12.8
     size 38.4 cells 
     lines 3.8 cells 
     split-orientation 1