I need to set up average word space of M/4 in InDesign where M = 10pt. That is equal to 2.5pt. InDesign lets me adjust word spacing in terms of percentage of fonts' native word spacing.
However, I have no idea how to get fonts' native word spacing figure, therefore I can't figure out what % of that I need to get 2.5 points. How/where can I read fonts' default word spacing from?