607384.fig.004a
(a)
607384.fig.004b
(b)
607384.fig.004c
(c)
607384.fig.004d
(d)
Figure 4: Radio telescopes appropriate for AME observations. From top left, clockwise, we see the Green Bank Telescope (https://science.nrao.edu/facilities/gbt/), Effelsberg (http://www.mpifr-bonn.mpg.de/8964/effelsberg/), Sardinia Radio Telescope (http://www.srt.inaf.it/), and Parkes (http://www.parkes.atnf.csiro.au/).