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Commissioning of Antenna 5

Using an improved holography technique, the surface of antenna 5 has been adjusted to about 60 tex2html_wrap_inline724 m, making it ready for 1.3 mm operation. Receivers have been coaligned to within 2'' with respect to each other. The pointing accuracy had caused some problem in the early tests: the effect has been traced back to a default in the encoder coupling with the elevation axis, and is now solved.