The authors regret that in the article [Acta Mater. 115 (2016) 250-258], Fig. 5 (b) contains an error in doubling the period of modulation due to wrong consideration of the fractional coordinates. The coordinates in Eq. 2 should be δk = 1, 2, ...n (integer).
The corrected modulation period is shown in Fig. 5(b). For sake of clarity the whole Fig. 5 is shown here.