Vista de la parte superior de la cabina del receptor de antenas ALMA

View of the upper part of the ALMA antennas receiver cabin. On the right, the Water Vapour Radiometer (WVR) with its Optical Relay towards the center. On top of it, the Amplitude Calibration Device (ACD). Also it can be observed the membrane and the shutter blades. © Sergio Otárola - ALMA (ESO/NAOJ/NRAO)