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SPSS has a concept called a TableLook to control the styling of pivot tables in output. SPSS 15 and earlier used .tlo files with a special binary format to save TableLooks to disk; SPSS 16 and later use .stt files in an XML format to save them. Both formats expose roughly the same features, although the older .tlo format does have some features that .stt does not.
This chapter describes both formats.