[igraph] understanding histogram output

[Jey Narasimhan]

Hi,

I am trying to collect the connected components histogram of my graph
using python-igraph. I have trouble understanding the following
output:

all compo hist: N = 186, mean +- sd: 328.4731 +- 4447.8554
Each * represents 2 items
[    2,     3):
*********************************************************************
(139)
[    3,     4): ****************** (36)
[    4,     5): *** (6)
[    5,     6): * (3)

In the first and last lines, why is the total number of items, an odd
number, if each * represents 2 items?
The stars and the values in the parentheses tally in the second and
the third lines, though.

Thanks.