In the end of Section 9.2 of Bosch's book *[Lectures on Formal and Rigid Geometry](http://www.math.purdue.edu/~tongliu/seminar/rigid/Bosch.pdf)*, a rigid $S$-space $E\_Q$ is constructed, for a variable $Q$ replacing the classical parameter $q\in k$. (Here $k$ is a non-archimedean field and $S=\mathrm{Spf}\mathbb Z[[Q]]$). Then $E\_Q$ may be viewed as the family of all Tate elliptic curves by looking at the morphism $Z[[Q]] \to k^\circ, Q\mapsto q$.


(1) It looks interesting but the reference is missing in Bosch's book. Which one of Raynaud's paper is about this construction?


(2) Could we in some sense further generalize it by considering more than one variables, i.e. $S'=\mathbb Z[[Q\_1,\dots, Q\_k]]$? Notice that $S'$ seems still satisfy the condition $(N)$ required by Bosch (see p 162)



Raynaud's universal Tate elliptic curves
**Q1:** Michel Raynaud, [Géométrie analytique rigide d’après Tate, Kiehl...](http://www.numdam.org/article/MSMF_1974__39-40__319_0.pdf), Bull. Soc. Math. France, Mémoire **39-40**, p. 319-327 (1974).


