<s>
A	O
Ragone	B-Application
plot	I-Application
(	O
)	O
is	O
a	O
plot	O
used	O
for	O
comparing	O
the	O
energy	O
density	O
of	O
various	O
energy-storing	O
devices	O
.	O
</s>
<s>
Ragone	B-Application
plots	I-Application
can	O
reveal	O
information	O
about	O
gravimetric	O
energy	O
density	O
,	O
but	O
do	O
not	O
convey	O
details	O
about	O
volumetric	O
energy	O
density	O
.	O
</s>
<s>
The	O
Ragone	B-Application
plot	I-Application
was	O
first	O
used	O
to	O
compare	O
performance	O
of	O
batteries	O
.	O
</s>
<s>
A	O
point	O
in	O
a	O
Ragone	B-Application
plot	I-Application
represents	O
a	O
particular	O
energy	O
device	O
or	O
technology	O
.	O
</s>
<s>
Consequently	O
,	O
the	O
iso	O
curves	O
(	O
constant	O
operating	O
time	O
)	O
in	O
a	O
Ragone	B-Application
plot	I-Application
are	O
straight	O
lines	O
.	O
</s>
