<s>
An	O
area	B-Application
chart	I-Application
or	O
area	B-Application
graph	I-Application
displays	O
graphically	O
quantitative	O
data	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
line	B-Application
chart	I-Application
.	O
</s>
<s>
The	O
area	O
between	O
axis	O
and	O
line	B-Application
are	O
commonly	O
emphasized	O
with	O
colors	O
,	O
textures	O
and	O
hatchings	O
.	O
</s>
<s>
Commonly	O
one	O
compares	O
two	O
or	O
more	O
quantities	O
with	O
an	O
area	B-Application
chart	I-Application
.	O
</s>
<s>
William	O
Playfair	O
is	O
usually	O
credited	O
with	O
inventing	O
the	O
area	B-Application
charts	I-Application
as	O
well	O
as	O
the	O
line	B-Application
,	O
bar	B-Application
,	O
and	O
pie	B-Application
charts	I-Application
.	O
</s>
<s>
His	O
book	O
The	O
Commercial	O
and	O
Political	O
Atlas	O
,	O
published	O
in	O
1786	O
,	O
contained	O
a	O
number	O
of	O
time-series	O
graphs	O
,	O
including	O
Interest	O
of	O
the	O
National	O
Debt	O
from	O
the	O
Revolution	O
and	O
Chart	O
of	O
all	O
the	O
Imports	O
and	O
Exports	O
to	O
and	O
from	O
England	O
from	O
the	O
Year	O
1700	O
to	O
1782	O
that	O
are	O
often	O
described	O
as	O
the	O
first	O
area	B-Application
charts	I-Application
in	O
history	O
.	O
</s>
<s>
Area	B-Application
charts	I-Application
are	O
used	O
to	O
represent	O
cumulated	O
totals	O
using	O
numbers	O
or	O
percentages	O
(	O
stacked	O
area	B-Application
charts	I-Application
in	O
this	O
case	O
)	O
over	O
time	O
.	O
</s>
<s>
Use	O
the	O
area	B-Application
chart	I-Application
for	O
showing	O
trends	O
over	O
time	O
among	O
related	O
attributes	O
.	O
</s>
<s>
The	O
area	B-Application
chart	I-Application
is	O
like	O
the	O
plot	O
chart	O
except	O
that	O
the	O
area	O
below	O
the	O
plotted	O
line	B-Application
is	O
filled	O
in	O
with	O
color	O
to	O
indicate	O
volume	O
.	O
</s>
<s>
When	O
multiple	O
attributes	O
are	O
included	O
,	O
the	O
first	O
attribute	O
is	O
plotted	O
as	O
a	O
line	B-Application
with	O
color	O
fill	O
followed	O
by	O
the	O
second	O
attribute	O
,	O
and	O
so	O
on	O
.	O
</s>
<s>
Area	B-Application
charts	I-Application
which	O
use	O
vertical	O
and	O
horizontal	O
lines	O
to	O
connect	O
the	O
data	O
points	O
in	O
a	O
series	O
forming	O
a	O
step-like	O
progression	O
are	O
called	O
step-area	O
charts	O
.	O
</s>
<s>
Area	B-Application
charts	I-Application
in	O
which	O
data	O
points	O
are	O
connected	O
by	O
smooth	O
curves	O
instead	O
of	O
straight	O
lines	O
are	O
called	O
spline-area	O
charts	O
.	O
</s>
<s>
Stacked	O
area	B-Application
charts	I-Application
in	O
which	O
the	O
area	O
is	O
displaced	O
around	O
the	O
central	O
axis	O
are	O
called	O
streamgraphs	B-Application
.	O
</s>
