Sample integral field units at FLAMES

An example of observations with Integral Field Units (IFUs) at FLAMES (only 4 of the 15 units are shown here). Each IFU is placed so that it records the light from 20 small adjacent sky areas (each measuring about 3 x 2 arcsec 2). In this way, it is possible to register simultaneously the spectrum of as many different regions of a (distant) galaxy.