The sky texture is F_SKY1. Use the sky texture on ceilings of sectors to allow the sky scrolling effect to be drawn in that part of the screen.
Different Sky Heights
If different sectors with sky ceiling need different heights simply create a new sector within the existing sky sector. Give this new sector a sky ceiling and leave the upper side texture blank. This will cause the upper sides of the inner sector to draw over any side texture that falls behind them.
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