ExcerptPadding defines context
length for context chunks and affects
appearance of the
$&(body) template variable.
When building excerpts for presenting a document
in search results (using either Cached Copy or
the body section of the document,
or the original document),
search.cgi concatenates context chunks.
Every context chunk consists of a search query word padded with
its original context from the left and the right sides and can be
up to ExcerptPadding * 2 + length(word) characters.
The default value is 40.
The number of context chunks concatenated into a document except
can be approximately calculated as
ExcerptSize / (ExcerptPadding * 2 + length(word)).
So a larger ExcerptPadding value makes every
context chunk longer but reduces the number of context chunks
that can fit into ExcerptSize.