When I run curl I sometimes see a progress meter like this:
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
38 11.0M 38 4319k 0 0 20189 0 0:09:31 0:03:39 0:05:52 18472
What unit is Average Dload given in?
An answer which also contains a link to another page explaining the entirety of the progress meter (what each section means) would be preferred.