 In many cases, the expanse of airspace that is class E beginning at AGL is so large that only the areas that differ are marked on the chart.Thus, one may see only external borders within the chart, with the region extending off the chart.When class E airspace begins at altitudes other than AGL, AGL, or MSL, a delimiting border resembling links in a chain in dark cyan separates the areas, and specific altitudes are marked within or near them.