When to use flashers/dodger - Questions About Trout & Salmon

I just started trolling and I want to know when you should use flashers and how far away from your spoon they should be. I have 2 electric downriggers that I stack. How many flashers/dodgers should I use for this setup? Also what is the difference between flasher and a dodger.

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When to use flashers/dodger - Questions About Trout & Salmon

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