This code adds negative spacing around character "1" resulting in a more symmetrical placement of the period between "1" and "3", and positive spacing around en-dash. From the last figure it appears that — even after additional negative kerning — location of the period can be optimized further, but please note that such alternation of spacing should be done with care because neighbors of a given character can have different width. Strictly speaking, such spacing adjustments have to be performed via modification of the kerning pairs , but I found this way to be too time consuming for my level of LaTeX knowledge at the time of thesis writing, and decided to stay with the simpler microtype-based solution.
TeX is a computer program for typesetting documents, created by Donald Knuth . It takes a suitably prepared computer file and converts it to a form which may be printed on many kinds of printers, including dot-matrix printers, laser printers and high-resolution typesetting machines. LaTeX is a set of macros for TeX that aims at reducing the user's task to the sole role of writing the content, LaTeX taking care of all the formatting process. A number of well-established publishers now use TeX or LaTeX to typeset books and mathematical journals. It is also well appreciated by users caring about typography, consistent formatting, efficient collaborative writing and open formats.