From the 7z manual:

"pass={NumPasses}
     Sets number of passes for Deflate encoder. It can be in range from 
1 to 15 for Deflate and from 1 to 10 for BZip2. Usually big number gives 
a little bit better compression ratio and slower compression process."

As it turns out, the correct flag was -mpass=15, and it makes 
compression take significantly longer without noticeably reducing the 
file size (nearly double the time for a 0.1% size improvement).

-- 
William Tracy
afi### [at] gmailcom -- wtr### [at] calpolyedu

If we were told to parse starting *after* the supplied String, then do 
what we need to do to indicate pilot error.
     -- Laird Nelson, blogging on Java programming

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