Evolution of the two lighter oxygen isotopes in a 6 M_⊙ model (solar initial composition). Upper panel: ¹⁶O/¹⁷O ratio. Lower panel: ¹⁶O (solid) and ¹⁷O (dotted). Red lines refer to the models calculated by adopting the Iliadis et al. (2010) rate for the ¹⁷O(p, α)¹⁴N reaction, while black lines represent models obtained with the new LUNA rate (Bruno et al. 2016). t_f = 68 Myr corresponds to the age of the last computed model (end of the early AGB).