Page proofs are required for indexing: Page proofs are the typeset pages
with the
final page numbers
Once the indexing has started, no additions, deletions or movement of text,
pictures, etc. can occur because alterations in the flow to text on the page will
invalidate the page references of the index, and parts of the index will have to
be re-indexed. If the index has to be re-indexed, re-indexing charges will apply.
Page proofs are usually sent as PDFs or MS Word. doc by e-mail. Alternately,
the file(s) can be sent on a CD/DVD or as hard copy.
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PDFs sent by e-mail saves you courier fees;
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PDFs are a cross-platform method of transporting
documents;
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A hard copy of the book can be printed
from a PDF;
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PDFs have search capabilities that can
be useful at the editing stage.