tion of the graphs of the Binder cumulant25, Eq. (9), as a
function of T obtained at diﬀerent L. For clarity reasons,
we introduce also the following symbols: by TN (n) we
will denote the helical/fan phase transition temperature
for thicknessn, TC (n) will instead indicate the order-
ing temperature of the sample as deduced by looking at
the behaviour of the average order parameter (3), while
Tl
C (n) will be the l-th plane transition temperature re-
lated to the order parameter deﬁned in Eq. (2).