text: For this purpose, we look at the temperature depen- 
  dence of the rotation angle of the magnetization between 
  NN planes. 
  In Fig. 7, ∆ϕl(T ) for n = 8 and n = 16 
  (continuous and dashed lines, respectively), is plotted for 
  the outermost planes, l = 1 . . . 4. For both thicknesses, a 
  monotonic trend is observed for all l, but at variance with 
  what happens for the highest thickness, for n = 8 we see, 
  starting from a temperature T . TN (8), an abrupt drop 
  of ∆ϕ3 and ∆ϕ4, which rapidly reach an almost con- 
  stant value, only slightly larger than ∆ϕ1. In the tem- 
  perature range TN (8) . T < TC(8) we thus substantially 
  observe the same small magnetic phase shifts between all 
  NN layers, testifying an energetically stable quasi-FM 
  conﬁguration giving no contribution to the helical order 
  parameters. The latter point can be made clearer by 
  looking at the the peak position Qz,max of the structure 
  factor S(0, 0, qz). In Fig. 8 the average of Qz,max vs T is 
  reported, again for n = 8 and for diﬀerent lateral dimen- 
  sions L26. As expected from the previous argument, we 
  see that Qz,max = 0 for TN (8) < T < TC(8), while it be- 
  gins to shift to higher values as soon as the temperature 
  decreases below TN (8), making apparent a progressive 
  fan stabilization with Qz,max 6= 0 and reaching a value 
  of about 21◦ for T = 10 K. 