Fig. 4

Examination of the DEGs and HEGs. a Venn diagram of the differentially expressed contigs at high, mid and low altitudes. b Smear plots showing 573 mutual DEGs in red in each pairwise comparison. A smooth scatter was used to convert the number of points in each plot coordinate into a vector of colours representing the local point density. Darker shades of blue represent higher density of points. Only below a specific density or in case of significance the dot is drawn. c Heat map of the top 500 most highly expressed genes in each sample. Colours represent the FPKM value of the gene expression after scaling and centring