creating a two-column file

I have a code which gives me my results as column of numbers just like
the following:
2
3
-8
9
57
5
34
..
..
..
-10

Is it possible to make a script which can take these values and put
them in a table forum such that they form a second column, the y
column, and get the form:
2 2
4 3
6 -8
8 9
10 57
12 5
14 34
.. .
.. .
.. .
100 -10

the idea is that I want to add the first column, which runs in a
controlled pattern (add 2 each step), to the results column so I can
have a file with two columns which fits the gnuplot.

I hope I could make it clear

thanks

.

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