It's far easier to spot an unnecessary comma, an odd choice of grammar, or a good place for an emdash when you hear it out loud. (sciencemag.org)
For 30 seconds she exposed 14 volunteers to a specific range of numbers (like, 17 to 19) in the same notation & emdash; either numerals or a cluster of dots. (scientificamerican.com)
Full justification works properly (kepub reader doesn't properly justify some lines that contain certain common characters such as ellipsis and emdash) (wiki.mobileread.com)