EN
Let 1 ≤ p < 2 and let $L_{p}= L_{p}[0,1]$ be the classical $L_{p}$-space of all (classes of) p-integrable functions on [0,1]. It is known that a sequence of independent copies of a mean zero random variable $f ∈ L_{p}$ spans in $L_{p}$ a subspace isomorphic to some Orlicz sequence space $l_{M}$. We give precise connections between M and f and establish conditions under which the distribution of a random variable $f ∈ L_{p}$ whose independent copies span $l_{M}$ in $L_{p}$ is essentially unique.