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Electromagnetic Signals and Backgrounds in Heavy-Ion Collisions:
Aspects of the dilepton spectrum in heavy-ion collisions are discussed, with
special emphasis on using lattice computations to guide the phenomenology of
finite temperature hadronic matter. The background rates for continuum
dileptons expected in forthcoming experiments are summarised. Properly
augmented by data from ongoing measurements at HERA, these rates will serve as
a calibrating background for QGP searches. Recent results on the temperature
dependence of the hadronic spectrum obtained in lattice computations below the
deconfinement transition are summarised. Light vector meson masses are strongly
temperature dependent. Accurate measurements of a resolved -peak in
dimuon spectra in present experiments are thus of fundamental importance.
[file-length=200k characters; instructions for processing given; some Latex
versions give error messages: ignore them completely]Comment: 9 pages (incl figures), preprint HLRZ 53/9