Running sync_info
inside the monerod
prompt outputs something similar to this (IPs and other information redacted/modified for privacy reasons):
Height: ., target: 1486690 (.%)
Downloading at . kB/s
7 peers
a.b.c.d:18080 ................ 1486690 . kB/s, 0 blocks / 0 MB queued
e.f.g.h:18080 ................ 1486690 . kB/s, 0 blocks / 0 MB queued
i.j.k.l:18080 ................ 1486690 . kB/s, 0 blocks / 0 MB queued
...
13 spans, 0 MB
a.b.c.d:18080 20 (1292174 - 1292592) -
e.f.g.h:18080 20 (1302114 - 1302532) -
i.j.k.l:18080 20 (1312194 - 1312312) -
...
What does the 13 spans, 0 MB
represent? What does the 20
(number of blocks?) below that mean?