Top: pEW(He IR) as function of effective temperature. Bottom: pEW(He IR) as function of spectral type. Blue crosses represent all sample stars (i. e. the non-valid pEWs), while black dots represent the as valid selected pEWs. In the top panel, magenta diamonds represent literature data from Sanz-Forcada & Dupree (2008), Andretta et al. (2017), and Dupree et al. (2018). In the bottom panel, red dots correspond to the right y-axis and give the percentage of valid measurements for the selection criteria, (see text).