Specify the rectangular finite element mesh domain lengths for fe-manual finite element calculations.  This length may be different in each direction. If the usemesh keyword is included, then this command is ignored. The syntax is:

     domainLength {xlen ylen zlen}

where the parameters xlen, ylen, zlen are floating point numbers that specify the mesh lengths in the x-, y-, and z-directions (respectively) in units of Å.