Bisector span as a function of the radial velocities with 1σ error bars for the five targets. The ranges have the same extents in the x- and y-axes on each figure. A correlation between bisector spans and radial velocities is clearly detected with SOPHIE on KOI-219, showing that the transiting planet candidate is a false positive. For the other four targets, the HARPS-N measurements show no significant variations or trends of the bisector spans.