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The library stage carried no way to correct a frame shot on its side, and nothing kept the correction. A quarter turn now rides on the catalogue row (`rot`, beside `star`, carried over by a rescan), the two chips under the preview step it, and the tile, the strip thumbnail and the stage all read it through one bake so a frame is never stood on its side in one place and upright in another. The studio opens a frame at that angle and a turn made there is filed straight back onto the row, so either end of the turn is what the frame comes up at next time.