This happens when I sort the mete_data.xls: <img width="654" alt="屏幕快照 2019-12-19 09 58 04" src="https://user-images.githubusercontent.com/20600259/71138372-42ae5d80-2246-11ea-8160-627e2ad7292a.png"> <img width="654" alt="屏幕快照 2019-12-19 10 00 24" src="https://user-images.githubusercontent.com/20600259/71138417-6671a380-2246-11ea-99c1-72e5b3089608.png"> Why do different "area"(child label) have the same "Y2/Y"(child index)? And "Y2" misses 8, when "Y1" is 1. Could you explain it for me? Thanks.