Radio spectra of 1ES 2344+514 taken by Effelsberg, Metsähovi, OVRO and RATAN-600 from 2007 through 2009. Data from different instruments have been combined if the time difference was less than 14 days. The thin solid lines simply connect the data points. The legend contains the MJD range of the combined spectra. We recall that the detection limit of Metsähovi at 37 GHz under optimal conditions is ~0.2 Jy. See also Fig. A.2.