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...and, of course, order the first two independently makes no sense since they are geographic coordinates. So, what I am doing wrong? Thank you all very much for the help, Mario -- Dr. Mario A. Cozzuol Laborat?rio de Biologia Evolutiva Universidade Federal de Rond?nia BR 364, Km 9,5 78900-000 Porto Velho, RO Brasil Tel./Fax 55 69 217-8593 E-mail mario at unir.br

...one have any idea about where is the problem? (I guess it is sitting on my chair!) My system: Mandrake 9.1, R 1.7.1-1mdk, tcl/tk 8.3.3-21.mdk... Thnak you in advance! Mario -- Dr. Mario A. Cozzuol Laborat?rio de Biologia Evolutiva Universidade Federal de Rond?nia BR 364, Km 9,5 78900-000 Porto Velho, RO Brasil Tel./Fax 55 69 217-8593 E-mail mario at unir.br