Changes in estimated outcrossing rate (t) in the open-pollinated population with age for survival (SURV), basal area per hectare (BAH) and stem diameter of surviving trees (DBH). An estimate of t is not presented for SURV at age 4 years, as the pairwise difference between the least-squares means of the self population and either open-pollinated or polymix progenies was not statistically significant (Appendix 1). An arrow is depicted to indicate that accumulated mortality of selfs is taking place following age 4 years.