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Use an em (long) dash—no space on either side—when setting off text with a dash. Exception: Use spaces around the dash in datelines (VANCOUVER, Wash. — The college is building a new parking lot.) Note the following:

• A hyphen denotes a single term (blue-green).
• An N-dash indicates a range (10 – 20).
• An M-dash provides emphasis (The man—a frightening apparition—demanded money).