Using the temperature of nve in the npt

Hi all,

I read this sentence from a paper,
The system is relaxed for 1000ps under the microcanomical (NVE) ensemble. In the end, with the final equilbrium temperature of the NVE simulation ket, the system is relaxed for 1000ps at zero external pressure (NPT ensemble).

Could you tell me what the commands about that?

See fix nve and fix npt.

Steve