Numeric
The Filetab switch determines the width of a tab field for displaying tab (ASCII 9) characters in the file. The width of a tab field determines how white space is translated when the Realtabs switch is set to no. The Filetab switch does not affect the cursor-movement functions Tab (TAB) and Backtab (SHIFT+TAB).
Filetab:8
Entab, Realtabs, Tabdisp