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Outline everything changed after a date or a revision.

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Compare what's open in Cella PDFCompare what's openCompare an issue with any PDF you already have open.Overlay Pages in Cella PDFOverlay PagesTwo to four sheets over each other, each in its own colour.Detect Revisions in Cella PDFDetect RevisionsFill the revision schedule from each title block.Place PDF in Cella PDFPlace PDFLay a consultant's drawing over your sheet, then move, scale and tint it.Trace Paper in Cella PDFTrace PaperSee-through sheets to sketch on, each its own PDF layer.
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