| http://www.w3.org/ns/prov#value | - For Erbium, typical values for the length 1603 are in the range 5 to 100 meters, dopant concentration 1601 is approximately 0.1% to 0.5% by weight, and the disposition 1602 is a ring around the first core 1401 with an inner diameter of about one to two times the core diameter and a thickness of 2 to 5 microns.
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