Profiles of ⁴He, ¹²C, and ¹⁶O abundances at the first thermal pulse as a function of mass fraction. Left: profiles obtained increasing (dashed lines) and decreasing (dot-dashed lines) the 3α reaction rate by 12%. The continuous lines correspond to the data obtained with the standard rate. The green lines represent the abundance of ⁴He, the orange ones the abundance of ¹²C, and the purple lines the one of ¹⁶O. Right: same as in the left panel, but for a 3α reaction rate variation by ±24% and +34% (dotted lines).