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Variables x(1:3),y;
Parameters a(1:6);
Constants R=8.314, T=563.15;
Function y=-a1*exp(-a2/R/T)*(x1^a3)/(1+a4*(x2^a5)*(x3^a6));
Data;
6.34514148        0.0255312        0.01212732        0.007
6.10642476        0.2489292        0.02744604        0.0068
5.97876876        0.3702024        0.03382884        0.0055
5.89260096        0.446796                0.04340304        0.0048
5.7796254        0.5489208        0.0542538        0.0041
5.67941544        0.63828                0.06510456        0.0027
5.59899216        0.7148736        0.06893424        0.002
5.51601576        0.7914672        0.07531704        0.002
5.3711262        0.9318888        0.079785                0.0019
5.25751236        1.0403964        0.08489124        0.0018
5.14708992        1.148904                0.08680608        0.0017
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