[Angle] is an integer that specifies the angle number (the numbering scheme varies with the instrument).
[D] or [M] releases the monochromator (RELD and RELM are equivalent to REL2).
[T] or [S] releases the sample table (RELT and RELS are equivalent to REL3).
[A] releases the analyzer crystal (RELA is equivalent to REL5 and REL6).