Recently, STAR published the first measurements of v₂ and v₃ in central p+Au, d+Au and ³He+Au collisions via correlation between two charged particles which are both in middle rapidities(||<0.9).

Comparison of the ratios of v₂ (panel a) and v₃ (panel b) between a given small system and d+Au at similar <n_ch> for several p_Tselections. The solid lines indicate a fit to the data points, and the dashed lines indicate the corresponding eccentricity ratios obtained from Glauber-based model calculations with (e^c, large dash line) and without (e^a, small dashline) sub-nucleonic fluctuations, respectively.