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I was wondering about the vertical positioning of Hyphen, minus and N dash. Should all the three be at the same distance from the the base line or should the hyphen be higher and the minus and em/en dash be lower? Most of the posts talk about the width but not the vertical positioning. Also is figure height same as x-height( used here http://www.microsoft.com/typography/developers/fdsspec/maths.aspx description of plus sign)