Comparison of flux densities between GLOSTAR and MAGPIS. Top panel: The comparison of measured flux densities for 663 MAGPIS compact sources at 5 GHz (White et al. 2005) common to GLOSTAR. These compact sources are defined as sources with angular sizes < 6″ in MAGPIS. The dashed line means the flux densities are the same in MAGPIS and GLOSTAR. At the top, we show the color bar for the Y_factor (defined as S_int/S_peak) of the GLOSTAR detections, indicating the emission of sources in the GLOSTAR image are unresolved (defined as Y_factor < 1.1 in Sect. 4.3.1), compact (1.1 < Y_factor < 2.0) or extended (Yfactor > 2.0). Bottom panel: The comparison of flux densities of 484 compact MAGPIS at 1.4 GHz that are also detected by GLOSTAR at 5 GHz. The 1.4 flux densities from GLOSTAR is extrapolated from the 5 GHz flux densities and spectral indices of the GLOSTAR catalog.