A keyword indicated if the minimization directions should remain conjugate between major timesteps. Restart the algorithm at the start of every major timestep. If you deform the system you might want to use restart . This is the default. The element value pairs specify which element in the computational box should be changed, and by how much.
Element is one of xx, xy, xz, yx, yy, yz, zx, zy, zz .
The attempted change in the specified element is drawn from a gaussian distribution with mean 0 and variance value . Only one MC step is attempted at the beginning of each major timestep, all elements are attempted to be changed simultaneously. The effect of this type of montecarlo steps is to keep the terms of the stress tensor corresponding to the specified elements of the computational box zero. This is done as a series of one-dimensional minimizations, one for each element. The coefficient indicates the size of the initial step in the minimization, as a fraction of the largest element in the computational box.