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Convenince labels added to the top of each file to assist in creating
index-type help files for things like the XML editor screen (where
there's nothing to hook help to).

\label{Significant_Figures}
A \textbf{significant figures} specification tells the system how many significant
figures there are in the problem, as either a single number or a range of
acceptable values, expressed as \textbf{min,max}. The system will check to
make sure that the student's answer contains this many significant digits,
useful in many scientific calculations. For example, if the problem has three
significant digits, the significant digit specification is {}``3'', and
the answer is {}``1.3'', the system will require the students to type {}``1.30'',
even though numerically, {}``1.3'' and {}``1.30'' are the same. A significant
figure specification of {}``3,4'' means both {}``1.30'' and {}``1.300''
are acceptable.
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