Total reads: total reads from FASTQ files.
Valid reads: reads passed filtering(mininum base quality>=10, mismatch base pair<=1).
Median read counts for barcode: Median read counts for all barcodes.
Barcodes Q30: percent of barcode base pairs with quality scores over Q30, Q30 barcode counts / all read counts.
UMIs Q30: percent of UMI base pairs with quality scores over Q30, Q30 UMI counts / all read counts.