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My question is how can I control the font size of each chapter's and section's title? I tried \Large, \normalsize \small etc. But i am not satisfied, since I would like to control the font size exactly to a number, such as font size 16, 16.5, 17, etc. Could anyone tell how to achieve this? Thanks!!

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Any answer on this would heavily depend on the documentclass used, since many of them bring their own mechanism to alter the appearance. So i suggest that you provide a MWE – bloodworks Jan 14 '13 at 10:23
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The font size can be changed with

\fontsize{size}{skip} \selectfont

where size is the font size ans skip is the baseline skip (typically 1.2 times the font size).

If you want to know how to use that to change headers, you have to indicate which document class you are using.

However, I do not recommend fiddling with the font size to the point. Usually, the document class sets appropriate sizes that harmonize with each other.

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