• m_base : Syst< T_M, T_Q >
• m_pos : Syst< T_M, T_Q >
• m_v_cur_q : Variational::GalerkinStepInternals< T_M, T_Q, T_TQ, T_N_STEPS >
• m_v_prev_q : Variational::GalerkinStepInternals< T_M, T_Q, T_TQ, T_N_STEPS >