<s>
PP3	B-Language
is	O
free	B-Application
software	I-Application
that	O
produces	O
sky	O
charts	O
,	O
focussing	O
on	O
high	O
quality	O
graphics	O
and	O
typography	O
.	O
</s>
<s>
It	O
is	O
distributed	O
a	O
license	O
based	O
on	O
the	B-License
MIT	I-License
License	I-License
,	O
but	O
with	O
this	O
restriction	O
added	O
:	O
</s>
<s>
Sky	O
charts	O
are	O
produced	O
as	O
LaTeX	B-Application
files	O
,	O
so	O
an	O
installation	O
of	O
LaTeX	B-Application
and	O
Ghostscript	B-Language
is	O
required	O
to	O
obtain	O
results	O
in	O
PostScript	B-Language
or	O
PDF	B-Application
formats	I-Application
.	O
</s>
<s>
Knowledge	O
of	O
command	O
line	O
syntax	O
for	O
these	O
packages	O
is	O
however	O
not	O
required	O
,	O
as	O
PP3	B-Language
can	O
run	O
the	O
conversions	O
automatically	O
.	O
</s>
<s>
Initially	O
Wikipedia	O
's	O
own	O
star	O
charts	O
were	O
produced	O
by	O
PP3	B-Language
.	O
</s>
<s>
PP3	B-Language
generates	O
maps	O
in	O
the	O
azimuthal	O
equidistant	O
projection	O
.	O
</s>
