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..., angle = 55, scale.y = 0.7, pch = 16, main = "GWK" ) Error in segments(x, z, x, z2, col = col, cex = cex.symbols, ...) : 仩仩仩仩仩仩仩 invalid color specification Do you have an idea how I can accomplish this task? Is it at allpossible to do that with scatterplot and some low level functions orshall I look at other packages and functions? Thanks in advance for any help and ideas! Best regards, Michael 仩 -- HS Albstadt-Sigmaringen WebMail (http://webmail.hs-albsig.de) -- HS Albstadt-Sigmaringen WebMail (http://webmail.hs-albsig.de) [[alternative HTML version deleted]]