Ratio of the self-normalised yieldin different \pt intervals with respect to that in the $3 < \pt < 6 {\rm GeV}/c$ interval (left). Double ratio of the self-normalised yield of heavy-flavour hadron decay electrons to the self-normalised multiplicity in \pPb collisions at \sqrtsNN $= 8.16 \rm TeV$ in three \pt ranges (right).