***In my experience, there are two common styles. One is to use em dashes—but without spaces—for interrupting text, and the other is to use en dashes – but with spaces – for interrupting text***
Our own house style, Frab and Charles, is spaced en dashes (also spaced ellipses). There's no hard-and-fast rule; we just feel this looks neater on the page (treebook or ebook). Like many fine points of style (presentation of figures, times of the day, dates, etc), I reckon what really matters is absolute consistency within any particular work. Cheers. Neil
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