The aim of the present experiment is to study the angular distributions—mainly for a, b and c— in an effort to better understand their cluster structure . - - Structurally, yes (make an m-dash by using Alt + 0151) but they are usually considered too informal for journal writing. - - No, that is just verbal dribbling.
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snuppelinaWould commas surrounding "a, b, and c" be more formal than the m-dashes?Yes.