Mid-IR spectra of the interstellar medium in regions of the Milky Way and other galaxies obtained with the IRS instrument onboard the Spitzer Space Telescope. The Orion Bar is a UV irradiated molecular ridge in the Orion star-forming region. SMC and LMC refer to the Small and Large Magellanic Clouds. M 82 is a nearby galaxy with intense star formation activity. The luminous and ultraluminous infrared galaxies (respectively LIRG and ULIRG) spectra are templates obtained by stacking the spectra from a large sample of galaxies (Dasyra et al. 2009). The 0 <z< 1 and 1 <z< 2 spectra, where z means redshift, were obtained by stacking the spectra from a large sample of galaxies (Dasyra et al. 2009) and are presented in their rest frames. These spectra represent galaxies in the early universe.
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