Centrality indices instrength and outstrength based on the complete network models. In panel (a) the indices are plotted for the high and low happy bias groups, and panel (b) illustrates the individual variation within these groups. JOY = feeling joyful; POS = pleasant experiences; INT = feeling interested in things around me; SAD = feeling sad; IRR = feeling irritated; WOR = worrying; NEG = unpleasant experiences. Note. Estimations for panel (b) are based on multilevel group models (fixed effects) and individual variation within these groups (random effects). No separate individual models were estimated, and the lines in panel (b) should not be interpreted as such.