We present a simulation of the laser absorption spectra of Eu atoms in the $a{}^{8}{S}{7/2}\ensuremath{-}y{}^{8}{P}{7/2}$ band at $462.7 \mathrm{nm}$ measured previously in a buffer-gas-loaded magnetic trap [J. Kim et al., Phys. Rev. Lett. 78, 3665 (1997)]. The simulations of the hyperfine-resolved Zeeman spectra are based on exact magnetic eigenproperties of the states involved, and yield a complete assignment of all the features observed. This reveals that apart from the ${M}{J}=7/2$ state and its hyperfine substates, the ${M}{J}=5/2$ and $3/2$ states are also trapped at ${B}_{\mathrm{max}}=0.52 \mathrm{T}$ and a temperature of about $250 \mathrm{mK}.$