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...e the function "par()" to combine plot and plotCI and I use the function "print()" to combine xyplot. I tried to use these functions to combine xyplot and plotCI and plots but they do not work. Does anybody know how I can do this? Thank you very much in advance. Lucía Cañás Ferreiro Instituto Español de Oceanografía Centro Oceanográfico de A coruña Paseo Marítimo Alcalde Francisco Vázquez, 10 15001 - A Coruña, Spain Tel: +34 981 218151 Fax: +34 981 229077 lucia.canas@co.ieo.es http://www.ieo.es [[alternative HTML version deleted]]

...e interaction "factor*continuous covariate" and "continuous covariate* continuous covariate" used in the GLM? 3. Is right to introduce in the model the continuous covariates and the factor moreover their interactions? Thanks in advance. Best regards, Lucía Cañás Lucía Cañás Ferreiro Instituto Español de Oceanografía Centro Oceanográfico de A Coruña Paseo Marítimo Alcalde Francisco Vázquez, nº 10 15001 - A Coruña, SPAIN e-mail: lucia.canas@co.ieo.es Tel: +34981205362; Fax: +34981229077 http://www.ieo.es [[alternative HTML version deleted]]