(Anti)deuterons. (Anti)helions. (a): $B_2$ at $p_{\mathrm{T}}/A = $ 0.75 GeV/c as a function of multiplicity in HM pp collisions at $\sqrt{s} = 13$ TeV, in MB pp collisions at $\sqrt{s} = 13$ TeV  and at $\sqrt{s} = 7$ TeV , in p--Pb collisions at $\snn = 5.02$ TeV , and in Pb--Pb collisions at $\snn = 2.76$ TeV . (b): $B_3$ at $p_{\mathrm{T}}/A = $ 0.73 GeV$/$c as a function of multiplicity in HM pp collisions at $\sqrt{s} = 13$ TeV, in MB pp collisions at $\sqrt{s} = 13$ TeV, in p--Pb collisions at $\snn = 5.02$ TeV , and in Pb--Pb collisions at $\snn = 2.76$ TeV . Vertical bars and boxes represent statistical and systematic uncertainties, respectively. The two lines are theoretical predictions based on two different parameterisations of the source radius.