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Published online by Cambridge University Press: 27 October 2016
To improve our understanding of the mass loss in red supergiants (RSGs), it is of paramount importance to observe the wind acceleration region close to the star with high spatial resolution. I review the recent progress in milliarcsecond-resolution imaging of the surface and atmosphere of RSGs with optical and infrared long-baseline interferometers. The high resolution images of RSGs have revealed the true face of these behemoths, which have turned out to be very complex.