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...stddev, all the others are solid. At first I though this is a bug of the printer driver... But when importing the pdf file to CorelDraw, the result is the same. Only one of the blue stddev markers has a transparency property, the others are simply solid. BTW, trying to crop the pdf by using "pdfcrop" on linux results in an error. After fixing the missing transparency in CorelDraw and exporting the pdf again, this works as well... I'm not sure if this is a bug or just an improper pdf spec, as Acrobat displays the the pdf properly. Has anyone encountered something like this? Arne