Fig. 4 in Incipient sympatric speciation via host race formation in Phengaris arion (Lepidoptera: Lycaenidae)

Fig. 4 The number of effective migrants (Nm) between populations. Only those connections are shown where the number of migrants is greater than two. Thicker arrows indicate higher number of migrants. The abbreviations are the same as in Suppl. Table S1. The letter 'T' in the sample codes refers to spring arion, the letter 'N' indicates summer arion