Before revision:  Positivity of numerical solutions is then restored by a scaling limiter in reference to positive cell averages . Numerical examples are presented to demonstrate the third order accuracy and illustrate the positivity-preserving property in both one and two dimensions.
After revision:  The positivity of numerical solutions is then restored by a scaling limiter in reference to positive cell averages . Numerical examples are presented to demonstrate the third order accuracy and illustrate the positivity-preserving property in both one and two dimensions.