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. Author manuscript; available in PMC: 2011 Jan 21.
Published in final edited form as: Am J Physiol. 1974 Nov;227(5):1116–1123. doi: 10.1152/ajplegacy.1974.227.5.1116

FIG. 3.

FIG. 3

Block diagram of parallel-pathway model. CD(t) is donor concentration of tracer and CR(t) is recipient concentration corrected for sample replacement. wi is weighting factor, which gives the fractional utilization of each path length, li.