Periodic stars in the HeI line that did not show a periodicity in the CoRoT light curves. The first and third columns show bidimensional periodograms of the HeI line. The color code represents the power of the periodogram, varying from zero (white) to the maximum power intensity (black). The second and fourth columns show the HeI lines used to calculate the periodograms. Different colors correspond to different nights of observation, and the thick red line is the average line profile.