Because there is no long-range positionally ordered
structure in the NTB(*) phase, the value of B of the order of
106 Pa must reflect an existence of a periodic orientational
structure with a nanometer length scale for both chiral and
nonchiral materials. The nearly linear and monotonic increase
of B within the NTB(*) phase temperature range might be
attributed for example to quantitative changes of heliconical
structure.