What is the font used in these diagrams? I tried searching, but can't find exact one.
EDIT: www.identifont.com gives me "Chalfont Light" as a result, but this is not the font on diagrams.

What is the font used in these diagrams? I tried searching, but can't find exact one.
EDIT: www.identifont.com gives me "Chalfont Light" as a result, but this is not the font on diagrams.
