FIGURE S2. Non-linear regression (through the origin) of bootstrap value on branch length

Non-linear regression (through the origin) of bootstrap value on branch length. The observations were weighted by the number of SNPs (a) and loci (b). See text for further details. The weights are indicated by the darkness of the points, darker color meaning higher weight.

针对分支长度与自举值（bootstrap value）开展过原点非线性回归分析。观测值分别以单核苷酸多态性（Single Nucleotide Polymorphisms，SNPs）数目（对应组别a）与基因座（loci）数目（对应组别b）作为权重。详细信息参见正文内容。点的颜色深浅用于表征权重大小，颜色越深代表权重越高。