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I'd use ellipses for pauses, dashes are usually used for interruption. "I found this - " "That doesn't matter, look what I found!" As opposed to: "She... She's dead."
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/14542 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/