pEW values of the Hα vs the same measurements for He I λ5876 for separated time ranges since explosion: 0-10 days, 10-20 days, 20-30 days, and 30-40 days. The markers are established by SN type, corresponding to type SNe IIb: blue triangles; SNe II: red circles, and SNe 87A-like: green squares. The colour bars show how the colour intensity changes depending on the number of days since the explosion.