<s>
Pyxplot	B-Application
is	O
a	O
free	B-Application
software	I-Application
command-line	B-Application
graph-plotting	O
and	O
vector	O
graphics	O
package	O
.	O
</s>
<s>
Its	O
interface	O
is	O
similar	O
to	O
that	O
of	O
gnuplot	B-Application
,	O
but	O
its	O
graphics	O
engine	O
is	O
optimised	O
to	O
produce	O
output	O
in	O
a	O
style	O
appropriate	O
for	O
inclusion	O
in	O
academic	O
journals	O
.	O
</s>
<s>
The	O
LaTeX	B-Application
typesetting	I-Application
system	O
is	O
used	O
to	O
render	O
all	O
text	O
labels	O
,	O
making	O
it	O
easy	O
to	O
annotate	O
graphs	O
with	O
mathematical	O
expressions	O
.	O
</s>
<s>
In	O
addition	O
,	O
Pyxplot	B-Application
has	O
many	O
more	O
flow	O
control	O
constructs	O
than	O
gnuplot	B-Application
,	O
making	O
it	O
much	O
easier	O
to	O
perform	O
batch	O
operations	O
.	O
</s>
<s>
Pyxplot	B-Application
is	O
available	O
for	O
free	O
download	O
under	O
the	O
GNU	B-License
GPL	I-License
.	O
</s>
<s>
Pyxplot	B-Application
's	O
mathematical	O
environment	O
is	O
unusual	O
in	O
that	O
numerical	O
variables	O
can	O
have	O
physical	O
units	O
.	O
</s>
<s>
All	O
of	O
Pyxplot	B-Application
's	O
numerical	O
analysis	O
commands	O
,	O
such	O
as	O
curve-fitting	O
,	O
Fourier	O
transforms	O
and	O
histogram	O
generation	O
also	O
natively	O
support	O
quantities	O
with	O
physical	O
units	O
.	O
</s>
<s>
Pyxplot	B-Application
's	O
vector	O
graphics	O
drawing	O
commands	O
allow	O
positions	O
on	O
the	O
page	O
and	O
rotation	O
angles	O
to	O
be	O
specified	O
by	O
quantities	O
with	O
appropriate	O
physical	O
units	O
.	O
</s>
