On chief factors of parabolic maximal subgroups of the group Bt(2n)

This study continues the author's previous papers, where a refined description of the chief factors of a parabolic maximal subgroup involved in its unipotent radical was obtained for all (normal and twisted) finite simple groups of Lie type except for the group B-t(2(n)). In present paper, such a description is given the group B-t(2(n)). For every parabolic maximal subgroup of B-t(2(n)), a fragment of its chief series involved in the unipotent radical of this parabolic subgroup is given. Generators of the corresponding chief factors are presented in a table.