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[求助] 请问这个图的横坐标怎么看啊？一直没有弄懂，谢谢啦！

In order to trace back the origin of 18:3, the major lipid classes of plastids, MGDG, DGDG, and phosphatidylglycerol (PG), as well as those of the ER, phosphytidylcholine (PC), phosphatidylethanolamine (PE), and phosphatidylinositol (PI), were analyzed. the total amounts of MGDG (21.76-fold,P= 0.022), DGDG (22.36-fold,P=0.032),andPG(21.25-fold,P=0.153) were decreased in crown gall tumors, and again, the ER-specific phospholipid pools, PC (1.79-fold, 0.05), PE (1.31-fold, P= 0.29), and PI (2.61-fold,P= 0.002), were increased (Fig. 1B). Within all classes of the ER-derived lipids, the levels of those containing 18:3 were significantly (P#0.05) higher in tumors compared with reference stems (Fig. 1, C–H).

我只看得懂A图的横坐标是不同的脂肪酸，看不懂后面的那种类似于18:2-16:0是什么意思，是一种比值还是什么啊？谢谢啦！

1.jpg