.PAGE SIZE 60,80
.TITLE ^BSECTIONS\B
.LAYOUT 1			.! Titles and page numbers centered
.DISPLAY NUMBER "^B","\B"	.! Page number boldfaced
.FLAGS ACCEPT ¨			.! This allows us to use underscores freely
.SET PARAGRAPH 0
.AUTOPARAGRAPH
.FIGURE 7
.HEADERS
SECTIONS ^6
.FIGURE 1
^B________________________________________________________________________________\B
.FIGURE 2

You can divide your document into ^Bsections\B.  A section is a block of text
which is preceded by a ^Bsection header\B.  A section header is usually a string
of numbers (the ^Bsection number\B) followed by a title (the ^Bsection name\B),
as in:

.FIGURE.INDENT 16;10.1.2.3  Miscellaneous Features ^2

If your document is divided into chapters, the first number in the string is
the chapter (or appendix) number.  The number of numbers in the string (not
counting any chapter number) is called the ^Blevel\B of the section header.  The
above example might be a level 3 section header in chapter 10, or a level 4
section header in a non-chapter-oriented document.

To specify, for instance, a level 3 section header, you would use the RNO
command HEADER LEVEL, as in:

.FIGURE.INDENT 16;¨.HEADER LEVEL 3 Miscellaneous Features ^2

Note that you specify the ^&level\& of the section you want to begin (in this
case 3), not the actual ^&number\& of the section; RNO will correctly number
the section for you.  If you don't specify a level number, the current level
(from a preceding HEADER LEVEL or SET LEVEL command) is used.  HEADER LEVEL
is commonly abbreviated as ^BHL\B.

Within a chapter (for instance Chapter 5), the level 1 sections are numbered
^B5.1\B, ^B5.2\B, etc.  Within a non-chapter-oriented document, the level 1
sections are ^B1.0\B, ^B2.0\B, etc.  The trailing "^B.0\B" can be suppressed
by using the RNO command DISABLE TRAILING ZERO (and re-enabled by ENABLE
TRAILING ZERO).

If you use the AUTOSUBTITLE command, the section names are automatically used
for the page subtitles.  If RNO is building a table of contents for your
document, the section headers are by default included in this.

The maximum level allowed is 6.  You can disable levels above a given level
(independently for the document and for the table of contents) by using the
ENABLE LEVELS command.

Different levels of section headers can be formatted differently; this is
controlled with the commands STYLE HEADERS and DISPLAY LEVELS.  By default:
.KEEP.NO FILL

    - Level 1 and 2 headers are on lines apart from the section's text, with one
       blank line after the header.   Level 3-6 headers are ^Brun-in\B;  the text of
       the section continues on the same line as the header.
    - Level 1 section names are fully capitalized;  level 2-6 section names have
       their first letter capitalized  (all following letters are left unchanged
       from the input; if they are capitalized they will remain so).
    - All levels include the section number in the header.
    - All headers are left-justified,  rather than centered  (run-in headers are
       never centered).
    - There are two blank lines before the header.
    - A Header is begun on the next page if fewer than seven lines remain.
    - There are two spaces between the section number and the section name.
.FILL.NO KEEP

The section headers can be indented from the left and/or right margins using
the INDENT LEVELS command.  The section name part of each level's header can be
independently indented by using INDENT LEVEL TITLES.

The commands NUMBER LEVEL and SET LEVEL are useful for preparing large
documents, which may be spread over several REQUIRE files and under control of
several individuals.  They give you explicit control over the assignment of
section numbers, and provide a default if HEADER LEVEL is issued with no
level number.

The DISPLAY LEVELS command allows you to control the rendition of each
level's section header; for instance, you can underline the header, boldface it,
or specify an alternate font for it.  These renditions do not get propagated to
the table of contents or to page subtitles.  This command also lets you specify
that letters or Roman numerals are to be used instead of integers for some or
all of the elements in the string of numbers comprising the section number; any
such specification does get propagated to the table of contents.