<s>
SPEDAS	B-Operating_System
(	O
Space	O
Physics	O
Environment	O
Data	O
Analysis	O
System	O
)	O
is	O
an	O
open-source	O
data	O
analysis	O
tool	O
intended	O
for	O
Space	O
Physics	O
users	O
.	O
</s>
<s>
It	O
was	O
developed	O
using	O
Interactive	B-Language
Data	I-Language
Language	I-Language
(	O
IDL	B-Language
)	O
.	O
</s>
<s>
SPEDAS	B-Operating_System
is	O
free	O
software	O
that	O
can	O
download	O
and	O
manipulate	O
data	O
from	O
scientific	O
space	O
missions	O
.	O
</s>
<s>
Software	O
modules	O
can	O
be	O
developed	O
for	O
SPEDAS	B-Operating_System
,	O
extending	O
its	O
capabilities	O
.	O
</s>
<s>
SPEDAS	B-Operating_System
evolved	O
from	O
software	O
developed	O
for	O
the	O
THEMIS	O
mission	O
,	O
which	O
was	O
called	O
TDAS	O
(	O
THEMIS	O
Data	O
Analysis	O
Software	O
)	O
.	O
</s>
<s>
In	O
turn	O
,	O
TDAS	O
used	O
IDL	B-Language
code	O
developed	O
previously	O
for	O
earlier	O
missions	O
going	O
back	O
to	O
the	O
1990s	O
.	O
</s>
<s>
SPEDAS	B-Operating_System
was	O
developed	O
by	O
scientists	O
and	O
programmers	O
of	O
the	O
University	O
of	O
California	O
,	O
Berkeley	O
's	O
Space	O
Sciences	O
Laboratory	O
,	O
University	O
of	O
California	O
,	O
Los	O
Angeles	O
's	O
and	O
other	O
contributors	O
.	O
</s>
<s>
Three	O
different	O
types	O
of	O
SPEDAS	B-Operating_System
deployment	O
are	O
available	O
:	O
</s>
<s>
The	O
full	O
IDL	B-Language
code	O
for	O
SPEDAS	B-Operating_System
is	O
available	O
as	O
a	O
zip	O
file	O
download	O
.	O
</s>
<s>
To	O
use	O
this	O
,	O
users	O
must	O
install	O
and	O
license	O
IDL	B-Language
from	O
Exelis	O
.	O
</s>
<s>
IDL	B-Language
save	O
files	O
can	O
run	O
in	O
a	O
free	O
but	O
restricted	O
version	O
of	O
IDL	B-Language
,	O
called	O
IDL	B-Language
Virtual	O
Machine	O
(	O
VM	O
)	O
.	O
</s>
<s>
Users	O
have	O
to	O
download	O
IDL	B-Language
VM	O
from	O
Exelis	O
,	O
install	O
it	O
and	O
register	O
with	O
Exelis	O
before	O
they	O
can	O
use	O
the	O
SPEDAS	B-Operating_System
save	O
file	O
.	O
</s>
<s>
One	O
of	O
the	O
main	O
goals	O
of	O
SPEDAS	B-Operating_System
is	O
to	O
accommodate	O
the	O
needs	O
of	O
different	O
NASA	O
missions	O
.	O
</s>
<s>
Version	O
3.1	O
of	O
SPEDAS	B-Operating_System
includes	O
plugins	O
for	O
loading	O
data	O
from	O
the	O
following	O
missions	O
or	O
data	O
sets	O
:	O
</s>
