coords
small-cgap
genes
small-cgap
# decrease graph_max from 100 to 50, increase graph_min to 25
# and increase heightf from 0.07 to 0.15:
%GC0-100 graph_max=50,graph_min=25,heightf=0.15
# add a label to make it clear what's going on:
medium-label label-text=Percent GC: 25%-50%