[Wien] How can I choose a spacegroup choice 1

[军 易]

dear wien2k,
                I'was trying to generate the structure for PbWO4,(tetragonal I41/a structure) ,but when I choose the spacegroup(I41/a),the program automatically use the I41/a choice 2 which gives me the wrong structure ,I need the spacegroup(I41/a)choice 1,how can I choose the the choice 1? Does anyone know what happened to sructure? What steps should I take?
         



		
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