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...z, direction as w and speed as different colours. I imagine it's a lot easier than I think it is - I am very new to R. Could anyone please help with a starting point for this? Thanks, Zoe -- View this message in context: http://r.789695.n4.nabble.com/Plotting-tidal-speed-and-direction-in-R-tp4633587.html Sent from the R help mailing list archive at Nabble.com.