Difference in UV magnitudes versus UV magnitudes of GUViCS extended galaxies with more than one independent measurement. The NUV and FUV data are plotted in the left and right panels, respectively. The legend shows each point colored with respect to the GALEX field type of the magnitude taken from the field with the deepest exposure time in the comparison (i.e., the magnitude in the GUViCS catalog). The upper set of plots show magnitude differences for photometry done in fields from the same exposure time categories (i.e., in the ranges provided in Table 3). The lower set of plots show magnitude differences for photometry done in fields from different exposure time categories (e.g., DIS-MIS). The lightly shaded rectangle spanning the length of each plot represent the 1σ spread in the magnitude of all the differences. The dotted horizontal line marks the value of the mean of all the differences. The numerical values of these two quantities are given in the upper left corner of each plot.