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This is a continuation of the multi-instrument and multi-year project we started back in 2009. The main goal of the campaign is to study the flux and spectral evolution of the broad-band emission (from radio to multi-TeV) over a long baseline and over timescales as few days (or hours/minutes if the source flares). This multifrequency data set will allow us to understand better the underlying physics in Mrk501, as well as in High frequency Peaked BL Lacs in general.
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