size 400,400
yrange 0,13
xrange -100,500
axis
yaxis 1:january:2:february:3:march:5:may:6:june:7:july:8:august:9:september:10:october:11:november:12:december
#'ymajor' steps should be synchronised with numbers eg. "1" in this example
grid 100,1,grey,4,1,6,grey
