Profile of ⁴He, ¹²C and ¹⁶O abundances at the first thermal pulse as a function of mass fraction. Left: profile obtained by increasing (dashed lines) and decreasing (dot dashed lines) the ¹²C(α, γ)¹⁶O reaction rate by 20%. The continuous lines correspond to the data obtained with the standard rate. The green lines represent the abundance of ⁴He, the orange lines the one of ¹²C, and the purple lines the one of ¹⁶O. Right: same as in the left panel but for a rate variation of ±35%.