content_image/371455.jpg
<img src='content_image/371455.jpg'>

the whole transverse plan at the central space time rapidity | η$_{s}$ | < 0 . 2. η$_{s}$ is defined as η$_{s}$ = 1 2 ln[( t + z ) / ( t − z )]. The local rate per particle is calculated according to (7)-(9). We have also computed the average rate by counting interaction events, which occur in BAMPS within certain time intervals. The results from both calculations agree with each other. 

As mentioned before, the collision rate per particle, may determine the buildup of the elliptic flow v$_{2}$ , which is shown in Fig. 1 within the momentum rapidity | y | < 1. We have also calculated v$_{2}$ within | η$_{s}$ | < 0 . 2. The agreement of the two curves seen in Fig. 1 is unchanged. The reason why we show the v$_{2}$ result within | y | < 1 is to compare it with the experimental data (see Fig. 3). 

From Fig. 2 we see a moderate difference between the collision rates in the simulations with d$_{G}$ = 16 and d$_{G}$ = 40, whereas the average transport collision rates per particle shown in the right panel are much closer to each other. The slightly smaller transport collision rate in the calculation with d$_{G}$ = 40, compared to that with d$_{G}$ = 16, is the reason for the slightly smaller final v$_{2}$ with d$_{G}$ = 40 than that with d$_{G}$ = 16 (see Fig. 1). 

