The integral field device (IFU) is a mix of camera and spectrograph used to capture and map spectra across a field of see to be able to understand variation in excess of space. NIRSpec and MIRI have IFUs. 4 open up rectangles are overlaid around the picture. The rectangles are https://flipphone64062.gynoblog.com/28455376/the-fact-about-tech-stuff-for-christmas-that-no-one-is-suggesting