  In this paper we show azimuthal particle correlations in three different
small-system collisions with different intrinsic initial geometries. The
simultaneous constraints of $v_2$ and $v_3$ in $p/d/^3$He$+$Au collisions
definitively demonstrate that the $v_n$'s are correlated to the initial
geometry. In addition, we find that hydrodynamical models which include QGP
formation describe simultaneouly the elliptic and triangular flow data in a
statistically acceptable manner in all three systems.
