**Dear Lammps Users**

The unit cell of LiMn_{2}O_{4} crystal considered in my simulations contains 56 ions (8 lithium atoms, 16 manganese atom and 32 oxygen atoms) .In my main refrence paper

# # “Molecular Dynamics Simulations of SOC-Dependent Elasticity of Li_{x}Mn_{2}O_{4} Spinels in Li-Ion Batteries”# Doi: 10.1149/2.147306jes# # That i want to reproduce the results of this paper. Specificly I want to calculate the virial stresses. But in the content of this paper I don’t understand some lines :# # Although we apply the strain to the equilibrated system, the resultant stresses fluctuate depending on which equilibrium point is chosen. In order to obtain a converged stress, convergence tests are conducted by increasing the number of selections. We find that 400 points are enough to reach convergence#

**For each selected point, four different simulations are performed: three uniaxial deformations in the x, y, z directions and one** **hydrostatic deformation****. Stresses are calculated in the form of the virial stress**

Now my questions are :

1- What is the equlibrium point? What is the number of selection?

2- What is the hydrostatic deformation?