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In-transit observations of WASP-17 made with the MIKE spectrograph on the 6.5-m Magellan Telescope were analysed for excess planetary atmospheric absorption in the sodium I 'D' doublet spectral region. Using the interstellar sodium absorption lines as reference, we detect an excess 0.58 \\pm 0.13 per cent transit signal, with 4.5{\\sigma} confidence, at 1.5 {\\AA} bandwidth around the stellar sodium absorption feature. 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