Before Origin 2017, In Tools: Options ?Axis tab, when specifying unit separator as /<U>, or -<U>, an extra space shows after / or -.
In Origin 2018, by default no space will be added after / or -. User can manually set it as / <U>, or - <U> to add a space.
We will continue to have space before units separators by default. System variable @ATSS is added to control space before unit separator.
1: space before unit separator (default)
0: no space before unit separator