Sequencing & jSFS
Following assembly of the ddRADseq data, we recovered 124,484 loci (214,183 SNPs) for Thuja plicata , and 142,804 loci (893,487 SNPs) for Tsuga heterophylla , all of which were shared across a minimum of four individuals per species. To construct the jSFS for these species, the data were downsampled such that each SNP was represented in all individuals included in the jSFS (Table 1). In using the jSFS to make our inference about demographic histories, we excluded a considerable amount of sequence data, although the models are nevertheless distinguishable (Table 1).