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Compare what's open in Cella PDFCompare what's openCompare an issue with any PDF you already have open.Changes Since in Cella PDFChanges SinceOutline everything changed after a date or a revision.Overlay Pages in Cella PDFOverlay PagesTwo to four sheets over each other, each in its own colour.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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