text: The development of the helical arrangement of magne- 
  tization along the ﬁlm growth direction was investigated 
  by looking at the integral of the structure factor S(~q) 
  along the z-direction, i.e. by taking ~q = (0, 0, qz), and 
  making again use of the cumulant analysis in order to 
  locate the helical transition temperature at TN (16) = 