\pt spectra of (anti-)$^3$He (left) and (anti-)$^3$H (right) measured in $\mathrm{INEL}>0$ p--Pb collisions at $\energy = 5.02$ TeV. The bottom panels show the corresponding antiparticle-to-particle ratios as a function of \pt. Statistical and systematic uncertainties are indicated by vertical bars and boxes, respectively.