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14. Calling \@startsection

From an excellent tutorial page, we find that the \@startsection command is used by all the various sectioning commands. This command is defined in the latex.ltx file.

It takes six arguments.

{NAME}

Name of the section command, e.g., {paragraph}.

{LEVEL}

Depth of the section command, e.g., 0 for part, 1 for chapter, 2 for section. This value is compared to the secnumdepth and tocdepth counters to control numbering of sections and the depth of the table of contents.

{INDENT}

How far the heading should be indented. For no indent, use “\z@”, shorthand for zero points.

{BEFORESKIP}

If positive, the vertical rubber length to be inserted before the heading.

If negative, the first paragraph after the heading will not be indented, and the absolute value of the length is inserted before the heading.

{AFTERSKIP}

If positive, the vertical rubber length to insert after the heading.

If negative, use a run-in heading (make it the first part of the first paragraph), and insert its absolute value as horizontal space between the heading and the next word of the paragraph.

{STYLE}

Commands that alter the style of the heading.