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Table 1

Technical details of the GMVA stations.

Name Diameter Tsys at zenith Calib SEFD Pol. leakage (May 2010)
(m) (K) (Jy) (%)

Effelsberg (EF) 100 130 Diode 929 7 ± 3
Plateau de Bure (PB) 34.8 90 Average 409 3 ± 3
Pico Veleta (PV) 30 90 Chopper 643 2 ± 2
VLBA 25 100 Diode 2941 6 ± 3
Onsala (ON) 20 300 Chopper 6122
Metsähovi (MH) 14 300 Diode 17 647 4 ± 2

Notes. Values of PB are given for the combined array (i.e., in phased-array mode). Diode stands for the common on-off noise-diode method (or equivalent), which does not correct for the atmospheric opacity; chopper refers to the hot-cold chopper-wheel method (or equivalent; e.g. Penzias & Burrus 1973), which corrects for the opacity; and average refers to the Tsys average of all the PB antennas (accounting for the phasing efficiency and applying model-based estimates of the opacity). SEFD is the system equivalent flux density. The polarisation leakage column (D-term) is the average amplitude of the polarization-leakage factors, as estimated from the fitting for all the sources observed in the GMVA session reported in this paper (see Sect. 6). Onsala only records LCP (hence, there are no D-terms estimated).

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