Can I ask you to help understand the meaning of "Non-primary hits" and "tags" in the following paragraph related to RSeQC:
The result table reports total number of reads (excluding nonprimary hits) and tags (separate splice fragments of a read). Total assigned tags indicate how many tags can be assigned unambiguously to the ten different categories listed below.
Total Reads 49743155
Total Tags 63012643
Total Assigned Tags 57529077
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
Group Total_bases Tag_count Tags/Kb
CDS_Exons 36821030 34763281 944.11
5'UTR_Exons 34901580 2856644 81.85
3'UTR_Exons 54908278 9772738 177.98
Introns 1450606807 8468986 5.84
TSS_up_1kb 31234456 94103 3.01
TSS_up_5kb 139129272 161914 1.16
TSS_up_10kb 249300845 217980 0.87
TES_down_1kb 32868738 789703 24.03
TES_down_5kb 142432117 1368378 9.61
TES_down_10kb 251276738 1449448 5.77
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =