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August 2014 • The PCB Design Magazine 45 sketch routing Figure 3: Packed-style routing groups traces for dense situations. PART 1: TAKING CoNTRoL continues vent vias, yet if they are necessary, control their location. By default, the sketch router does not add vias except in two cases. First, if the fanout vias are needed and they do not exist, it will put them in. Secondly, when drawing a sketch path, the designer can specify a via pattern for tran- sitioning to another layer. There are four styles, with control over the direction of routing in and out of the pattern, and eight rotations of each. Route Style In the context of control, route style is a matter grouping the traces together or spread- ing them out. Assuming the rules are followed