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Definition of the used coordinate systems and typical configurations realized in thermophoretic micron-scale devices: (a) thermodiffusion cell with the temperature gradient parallel to gravitational field [55,56], (b) thermogravitational column configuration with a convective flow [41,47,58], (c) flow channel configuration [43,45,59] and (d) a heating wire configuration with a decrease in temperature with increasing distance from the wire [60].
