Represent main neuron object computed by single thread.
void update_actual_d_based_on_sp13_mat(NrnThread *nt)
void update_actual_rhs_based_on_sp13_rhs(NrnThread *nt)
void update_sp13_rhs_based_on_actual_rhs(NrnThread *nt)
void update_sp13_mat_based_on_actual_d(NrnThread *nt)