Fig. 6: Historical migration trajectories of ICRs in historical periods.

a An enlarged version of the Historical migration trajectories of ICRs; b the Historical migration trajectories of ICRs from Prehistory to pre-Qin period to Modern and Contemporary Periods. The abbreviations in the figure refer to different prefecture-level city: Chengdu(CD), Mianyang(MY), Zigong(ZG), Panzhihua(PZH), Luzhou(LZ), Deyang(DY), Guangyuan(GY), Suining(SN), Neijiang(NJ), Leshan(LS), Ziyang(ZY), Yibin(YB), Nanchong(NC), Dazhou(DZ), Ya’an(YA), Aba(AB), Ganzi(GZ), Liangshan(L-S), Guang’an(GA), Bazhong(BZ), Meishan(MS), Chongqing(CQ).