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• • • <br /> Figure 4 <br /> TPHG Concentration Vs Time <br /> 5000 — <br /> 4500 <br /> 4000 <br /> 3500 <br /> E 3000 <br /> 0 <br /> 0 2500 <br /> u <br /> ca <br /> 2000 -- <br /> 1500 -- <br /> 1000 -- <br /> 5w <br /> 00015001000500 <br /> 0 - <br /> May-95 Jul-95 Sep-95 Oct-95 Dec-95 Feb-96 Mar-96 May-96 Jul-96 Aug-96 Oct-96 <br /> Time <br />