<s>
A	O
streamgraph	B-Application
,	O
or	O
stream	B-Application
graph	I-Application
,	O
is	O
a	O
type	O
of	O
stacked	O
area	B-Application
graph	I-Application
which	O
is	O
displaced	O
around	O
a	O
central	O
axis	O
,	O
resulting	O
in	O
a	O
flowing	O
,	O
organic	O
shape	O
.	O
</s>
<s>
Unlike	O
a	O
traditional	O
stacked	O
area	B-Application
graph	I-Application
in	O
which	O
the	O
layers	O
are	O
stacked	O
on	O
top	O
of	O
an	O
axis	O
,	O
in	O
a	O
streamgraph	B-Application
the	O
layers	O
are	O
positioned	O
to	O
minimize	O
their	O
"	O
wiggle	O
"	O
.	O
</s>
<s>
Streamgraphs	B-Application
display	O
data	O
with	O
only	O
positive	O
values	O
,	O
and	O
are	O
not	O
able	O
to	O
represent	O
both	O
negative	O
and	O
positive	O
values	O
.	O
</s>
<s>
Streamgraphs	B-Application
and	O
their	O
use	O
were	O
popularized	O
by	O
Amanda	O
Cox	O
in	O
a	O
February	O
2008	O
New	O
York	O
Times	O
article	O
on	O
movie	O
box	O
office	O
revenues	O
.	O
</s>
<s>
A	O
related	O
graph	O
,	O
sometimes	O
conflated	O
with	O
streamgraphs	B-Application
,	O
is	O
the	O
ThemeRiver	O
,	O
in	O
which	O
the	O
"	O
silhouette	O
"	O
of	O
the	O
graph	O
is	O
symmetrically	O
arranged	O
around	O
the	O
central	O
axis	O
.	O
</s>
<s>
Streamgraphs	B-Application
were	O
found	O
to	O
be	O
more	O
readable	O
than	O
basic	O
stacked	O
area	B-Application
graphs	I-Application
or	O
ThemeRivers	O
for	O
value	O
comparison	O
tasks	O
.	O
</s>
<s>
Streamgraphs	B-Application
are	O
officially	O
supported	O
by	O
Matplotlib	B-Language
and	O
D3.js	B-Language
.	O
</s>
<s>
Marco	O
Di	O
Bartolomeo	O
and	O
Yifan	O
Hu	O
(	O
2016	O
)	O
propose	O
several	O
improvements	O
to	O
streamgraphs	B-Application
,	O
such	O
as	O
using	O
1-norm	O
minimization	O
instead	O
of	O
2-norm	O
minimization	O
.	O
</s>
