One often expects to label the axes (not just the tick marks) on a map or plot, e.g. with strings "Lat."/"Lon." or "Northing (metres)"/"Easting (metres)".However, Axes.set_xlabel and set_ylabel (nor ...

The x axis has labels from 0 to 1. The eps file has the same tick labels as the png file, but a second set of tick labels are superimposed, running from 0 to 1 on both the x and y directions.