  We study a relation between two refinements of the rank one abelian
Gross-Stark conjecture: For a suitable abelian extension $H/F$ of number
fields, a Gross-Stark unit is defined as a $p$-unit of $H$ satisfying some
proporties. Let $\tau \in \mathrm{Gal}(H/F)$. Yoshida and the author
constructed the symbol $Y_p(\tau)$ by using $p$-adic $\log$ multiple gamma
functions, and conjectured that the $\log_p$ of a Gross-Stark unit can be
expressed by $Y_p(\tau)$. Dasgupta constructed the symbol $u_T(\tau)$ by using
the $p$-adic multiplicative integration, and conjectured that a Gross-Stark
unit can be expressed by $u_T(\tau)$. In this paper, we give an explicit
relation between $Y_p(\tau)$ and $u_T(\tau)$.
