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| doi = 10.1146/annurev.astro.39.1.249
| date = September 2001
|arxiv = astro-ph/0105539 |bibcode = 2001ARA&A..39..249H | s2cid = 45573664
}}</ref> The figure shows a schematic picture, based on many different data sets, of the spectral intensity (also called spectral radiance) multiplied by wavelength of the DEBRA over all the electromagnetic spectrum. This representation is convenient because the area inside the curve is the energy. The nature and history of the universe is coded in this radiation field and any realistic cosmological model must be able to describe it. Understanding the DEBRA is a major challenge of modern cosmology with huge consequences in other fields of astrophysics, therefore extraordinary efforts are being put by theoreticians, observers, and instrumentalists to do so.
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