What are the specifications for documents placed on the scanner glass?
Original documents placed on the scanner glass must not exceed 11.7 × 16.5 inches (297 × 420 mm). You can place multiple originals on the glass as long as they are at least 0.2 inches (5 mm) apart from each other.
From the official Epson WorkForce Pro WF-7510 All-in-One Printer manual, page 53
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