Replacement of values during simulation

Dear nonmemusers: I’m performing some simulations in order to verify the behaviour of my model. My iDV and DV are time an concentration respectively. In my case it would be useful to replace all simulated data (DV) that have values less or equal than -3.9 by this value: -3.0. Does anybody could help me how to give this instruction to NONMEM7 in order to replace all this values during simulation? Thank you in advance! Elba PhD student UNAV