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The editing data wrote art space with its origin at the first artboard's bottom-left corner, its artboard records lacked keys a reader requires, and its %%Creator line made the reader measure %AI3_TemplateBox on an 8640-point canvas. Other apps opened the art 3,871.5 points away from its artboard. Art space is now ruler space, as in the .ai files users sent: y up from the first artboard's top-left corner. The artboards together are centered on the 16383-point canvas. Each artboard's record gives its top-left corner there (RulerOrigin), its pixel aspect ratio (PAR), DisplayMark and whether it is selected, and %AI3_TemplateBox holds the canvas's center. %%Creator names the format's app and holds no version number. %AI3_Cropmarks and %AI3_TileBox give the first artboard, %AI5_ArtSize is 14400 14400, and the /Document dictionary gives the canvas size. A file with several artboards carried the data on its first page only, and other apps opened it as a PDF, page by page. Every page now refers to the one data dictionary, as the files users sent do. The format details come from users' own .ai files, static analysis of Illustrator's program and the user's manual testing in Illustrator.