The article isn’t consistent in what it calls leading.Īt the beginning it claims that ‘leading refers to the distance between the baselines of successive lines of type’ but later it refers to negative leading which would mean lines are set in reverse order and ‘50% leading’ which would mean space between baselines of half the size of the font. Sciurius ( talk) 21:42, 24 August 2010 (UTC) Reply Merger proposal The normal, default base line distance is 1.2 for most modern typesetting programs. Bottom line: when using the distance between base lines, it's just 1.0 (single space), 1.5 (one and a half) and 2.0 (double space). Since Knuth was a perfectionist, the baselineskip varies slightly between font sizes, hence the small variations. Likewise, double space = 1.667 * 1.2 = 2.0 (close enough). So one-and-a-half spacing = 1.25*1.2 = 1.5, exactly what would be expected. The effective value is calculated by multiplying baselineskip by baselinestretch. How is this different from the LaTeX system. I haven't used Microsoft Office lately, but Open Office shows that the factors are 1.0, 1.5, and 2.0. Doing some math would tell you that there is a ratio of 1.2 between 1.5 and 1.25 (one-and-a-half-spacing), and between 2.0 and 1.6667 (double spacing). Thus, for the layman, it is not entirely evident why these factors are not 1.0, 1.5, and 2.0. However, in the LaTeX system, there is a package by the name " setspace.sty" that sets the "\baselinestretch" property to 1.0 for "single spacing", 1.25 (and variations such as 1.213, and 1.241) for "one-and-a-half spacing", and 1.6667 (and variations such as 1.618, and 1.655) for "double spacing". Simple logic would tell you that these constitute factors of 1.0, 1.5, and 2.0, which multiply some constant value. There needs to be some explanation on exactly what constitutes the common terms "single spacing", "one-and-a-half spacing", and "double spacing".
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