File:Mertens.jpg
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![File:Mertens.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/Mertens.jpg/800px-Mertens.jpg?20170712154157)
Size of this preview: 800 × 512 pixels. Other resolutions: 320 × 205 pixels | 640 × 410 pixels | 1,024 × 655 pixels | 1,280 × 819 pixels | 1,600 × 1,024 pixels.
Original file (1,600 × 1,024 pixels, file size: 241 KB, MIME type: image/jpeg)