Number of potential g-mode pulsations with S/N ≥ 4 per star. Frequencies were deduced from Step 1 described in Sect. 4. Our sample of 1967 stars has 1108 stars that are not in compliance with our Step 1 criterion and those are not plotted. The dashed red line shows the cut used to select rich enough period-spacing pattern candidates, namely, stars with at least ten significant mode periods. This resulted in 369 candidate pulsators.