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This article is an erratum for:

Volume 533, September 2011
Article Number C1
Number of page(s) 1
Section Astronomical instrumentation
Published online 07 September 2011

© ESO, 2011

In Sect. 3.1 of Martí-Vidal et al. (2010b), we gave the following expression (Eq. (3)) (1)where K ~ 12.4   h0.5 GHz-1. This equation is inconsistent with the results reported in Sect. 5.3 of Martí-Vidal et al. (2010a). The correct expression should be, instead, (2)

where K ~ 0.012   h0.5 GHz-1. This new equation implies a different value of the constant k1 in Eq. (4). The original value reported for k1 was  ~63, while the correct value is  ~1.3 × 104.

Although Eq. (3) (together with the constants K and k1) was incorrectly written in the text, we emphasize that all the figures in the paper were generated, indeed, using the correct equations and constants.


  1. Martí-Vidal, I., Guirado, J. C., Jiménez-Monferrer, S., & Marcaide, J. M. 2010a, A&A, 517, A70 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]
  2. Martí-Vidal, I., Ros, E., Pérez-Torres, M. A., et al. 2010b, A&A, 515, A53 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]

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