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**a**,

**b**,

**c**) in Wien2k, one has to specify locations of atoms in unit cell.There are three components X,Y,Z which determine the atom location. I want to know whether "X,Y,Z components" are corresponding to vectors a,b,c or they are components of the cartesian system? In other words If we have a typical (X,Y,Z), dose it means that atom location is

**r**=X

**a**/a+Y

**b**/b+Z

**c**/c or

**r**=X

**i**/a+Y

**j**/b+Z

**k**/c?