I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 53)

Readiris TM Corporate 12 – User Guide
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Important: select the document language before executing page
analysis when you are dealing with Asian or Hebrew documents.
Specific page analysis routines are used for these documents.
The recognition can also be limited to a Numeric character set to
optimally recognize tables and figures. Readiris then only recognizes
the numerals 0-9 and the following series of symbols:
To activate numeric mode, select Numeric at the top of the Primary
language list.