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How can I draw a horizontal line spanning only some of the table cells?
I need to recreate table 12 of this document manually (because unfortunately this automatic program doesn't seem to work properly).

I think a unique aspect is a horizontal line that doesn't span all columns.
booktabs; the short lines are produced with\cmidrule. – egreg Jun 07 '12 at 23:37siunitxfor columns aligned at the decimal point. How to place a note below the table is demonstrated in this answer (threeparttablexalso offers a\sourcecommand). For the environment, you may start with atabularto keep it simple and possibly extend e.g. to atabulater on. Placement of the tabular inside atableis optional, but usually desirable. – dgs Jun 07 '12 at 23:45booktabsanswers to the predecessor of this duplicate question: http://tex.stackexchange.com/a/59035/4012 – doncherry Jun 08 '12 at 08:53