The authors regret the following errors:

1. Equation (19) should be 
1R¯R¯(R¯P¯H¯3P¯R¯)+1R¯2θ(P¯H¯3P¯θ)=Λ(P¯H¯)θ
2. Equation (22) should be  
min[f1(x),f2(x),,fm(x)]

3. The compressibility number in Table 1 should be 3.68.

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