VZJ -- Massoudieh et al. 6 (2): 306 Figure IG3

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FIG. 3. Mass balance diagram for a finite volume in x– ${tau}$ space; shown is a two-dimensional control volume where one of the dimensions corresponds to a conventional spatial coordinate (x) and the other to exposure time ( ${tau}$ ). Through each side of this control volume is shown the facewise specific fluxes in the directions of space and exposure time, respectively.