Imports golang.org/x/image/font golang.org/x/image/font/opentype gonum.org/v1/plot gonum.org/v1/plot/font gonum.org/v1/plot/font/liberation gonum.org/v1/plot/plotter gonum.org/v1/plot/vg gonum.org/v1/plot/vg/vgimg Standard library imports archive/tar bytes compress/gzip fmt image image/color image/draw image/jpeg image/png io log math net/http os strings