Window width (frame, outside)
Ceiling height
Rod past the frame, each side
Rod above the frame
Curtain stack when open (each side)
Rod length to buy
Glass still covered when open
Gap rod to ceiling
Window looks
Rod hard against the frame
Rule of thumb
Make it look taller
Front view of the wall, window height fixed at 130 cm. The stack width is a rough figure: thin curtains pile up narrower than thick, lined ones. Measure your own curtains once they are open.