Figure A2 is a copy of Figure 1, but with additional points overlaid to show where the average attainment of males and females would sit.
Mae Ffigur A2 yn gopi o Ffigur 1, ond mae'n cynnwys pwyntiau ychwanegol wedi'u troshaenu i ddangos lle byddai cyrhaeddiad cyfartalog gwrywod a benywod.