Accuracy of individual PCs for scRNA-seq data with 1,306,127 cells and 23,771 genes. The top left plot is the accuracy (minSSE) of each PC in which results by PCAone_Arnoldi are used as the true value. PC 33 and 34 are shown for PCAone and OnlinePCA.jl_Halko to illustrate the difference compared to the accurate PCAone_Arnoldi.