Visualization of family-wise SNP effects. Barley chromosomes are indicated as inner circle of colored bars, centromeres are highlighted as transparent boxes. Grey connector lines represent the genetic position of SNPs on chromosomes. Each track displays one HEB family (F01 – F25, from inside to outside). The heatmap indicates the difference in days between the donor and Barke genotype. Blue and red colors specify early and late flowering, respectively, caused by the donor genotype. White color indicates no SNP effect or SNPs monomorphic in the respective family. Candidate genes (Table 1) are indicated outside the circle. Black frames highlight their family-specific effects as indicated in Additional file 6.