Table 1
List of instruments participating in the multifrequency campaign and used in the compilation of the light curves and SEDs shown in Figs. 2 and 5.
Notes. The instruments with the symbol “∗” observed Mrk 501 through the GASP-WEBT program. The energy range shown in Col. 2 is the actual energy range covered during the Mrk 501 observations, and not the nominal energy range of the instrument, which might only be achievable for bright sources and excellent observing conditions. See text for further comments.
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