The difference in the overall alloying pattern curve in Jericho and in Tell El-Dab'a shown by Philip ( 1995 ) does not necessarily have to be related to two different production centers, but could as well be the result of comparing different groups of objects ( i . e ., more prestigious weapons of control alloying either with tin or with arsenic ) at Tell El Dab a and similar objects mixed with simpler copper-based ones ( like simple daggers, knives, toggle pins, etc . ) in Jericho and / or types like the spearheads that have more mixed, low levels of both alloys.