[Qx] specifies the first coordinate of the q-vector.
[Qy] specifies the second coordinate of the q-vector.
[Qz] specifies the third coordinate of the q-vector.
[Et] specifies energy transfer. Fixed energy type and fixed energy value are determined by the most recently executed Q- or B-buffer.
For example, DQ=1,0,0,5 will drive angles A3 and A4 to Q=(1, 0, 0) and an energy transfer of 5 meV. Note that lattice and orientation parameters are determined by the most recently executed Q- or B-buffer. Use PLAT to see current values of these parameters.