These differences, as represented by the yellow arrows, are what is plotted on Figure 5 in the statistical release to quantify the gap.
Y gwahaniaethau hyn, fel y'u cynrychiolir gan y saethau melyn, yw'r hyn sy'n cael ei blotio ar Ffigur 5 yn y datganiad ystadegol i feintioli'r bwlch.