[gmx-users] Can gmx change a, b of 3D pbc box but remain c in constant-NPT MD?

[英雄不再寂寞]

Dear gmxers,
    I want to perform a constant-NPT MD simulation using gmx. By default, a,b,c of 3D pbc box can change to compatile with the density. Whether can gmx change a,b of 3D pbc box but unchange c? Please give me some hints. Thanks a lot.
  
 Yours sincerely,
 Chaofu Wu, Dr.
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