Hello everybody! I've just drawn an interaction plot between two factors, and I would like also to draw the Tukey HSD intervals, but I only was able to draw sd arrows. How I can draw that with R? Thank you very much and many thanks for your advices. Regards _______________________________________________________________________________________________ Michelangelo La Spina Equipo de Protección de cultivos - Control Biológico Departamento de Biotecnología y Protección de Cultivos Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA) C/ Mayor s/n 30150 La Alberca (Murcia) - ESPAÑA teléfono: +34 968 362 788 fax: +34 968 366 792 móvil: +34 618 451 079 web: http://www.imida.es/equipos/eq_prot_cultivos_comp.html e-mail: michelangelo.la@carm.es [[alternative HTML version deleted]]