N\
2009-07-27 & 00031401016 & 5181 & N\
2009-08-02 & 00031401017 & 5934 & Y\
2009-08-03 & 00031401018 & 4647 & Y\
2009-08-09 & 00031401019 & 6968 & Y\
2009-09-13 & 00031401020 & 33 & Y\
2009-09-14 & 00031401021 & 4593 & Y\
2009-09-16 & 00031401022 & 4587 & Y\
2009-09-20 & 00031401023 & 5858 & Y\
2009-09-21 & 00031401024 & 6135 & Y\

VLBI radio observations {#VLBI}
-----------------------

N4088–X1 was observed with the EVN at 5 GHz on 2012 June 01 (project code: EM095A; PI: Mezcua). Eight antennas participated in the observations: Effelsberg (Germany), Westerbork (The Netherlands), Jodrell Bank (United Kingdom), Onsala (Sweden), Medicina (Italy), Noto (Italy), Torun (Poland), and Yebes (Spain). The observations were performed using the phase-referencing technique, in which the target and a nearby, compact, bright source (the phase calibrator) are observed interleaving scans. A target-phase calibrator cycle of four minutes (3 minutes on the target, 1 min on the phase calibrator) was used. As a result, a total of 2.7 h was spent on the target source. The source J1203+4803 was used as phase calibrator, while the bright and compact radio source 4C+39.25 was used as fringe finder and bandpass calibrator.

The data were recorded 