The yellow part is O3 (Han Chinese haplogroup), red part is O2a, pale blue is O1, pink part looks like a bunch of haplogroups together based on the legend at the bottom of the picture. But the words of the legend are so tiny that I can hardly see it. I think it says that the pink part are N*, O2*, C3*, Q1, N1.
Yellow part is once again Han Chinese O3 haplogroup. Vietnamese has a fair bit of O3, but less than that of the Han Chinese of course. It is interesting to see that Vietnamese has some O2b, a genetic marker that is dominant in Koreans and Japanese that are not found in neither Northern nor Southern Han. However, Vietnamese and Japanese lack Q1 (dominant in Kazakh) that the Koreans, Northern Han, and Southern Han have a bit of.
What is the significance? Significance indicates that O3 Haplogroup that makes up Han genetics is more prominent in Southern Chinese, such as Hakka, Teowchew than even Northern groups.
It solidifies my statement that Southern Han are more progenitors of original Han genetic composition, and even language than others.