Before revision:  The two intervention strategies (SD and TQ) try to reduce the disease reproductive number (R_0 > 1) to a target value ( R_0^{\rm target} < 1 ) , but in distinct ways, which we implement in our model equations.
After revision:  The two intervention strategies (SD and TQ) try to reduce the disease reproductive number (R_0 > 1) to a target value R_0^{\rm target} < 1 ) , but in distinct ways, which we implement in our model equations.