Code:
This is a test with 10 spaces between here>          <and here.
If you copy the code line above and paste it into a text editor that can display unprintable characters, you will find the every 2nd space in the gap has been replaced by a xA0 character.

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input str6 country str15 occupation str19(survey typeofsource) byte(yr1995 yr1996 yr1997 yr1998 yr1999)
"Mordor" "Total (ISCO-88)" "Mordor CPS"          "Population census"   100 100   .   .   .
"Mordor" "Total (ISCO-88)" "Mordor ACS"          "Population census"     . 100 100 100 100
"Mordor" "Total (ISCO-88)" "Middle Earth Labour" "Labour force survey"   .   .   .   . 100
end