Determine the lattice parameter of Tetragonal system

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Main Question or Discussion Point

As a part of our exercise we need to determine the lattice parameter of the given xrd peaks (http://bama.ua.edu/~mweaver/courses/MTE481/Lab2_PP.pdf [Broken]. the last page of the link), heres the peak data:

2theta
23.73
39.23
46.36
56.69
62.31
71.1
76.15
84.35
89.2
97.29
102.21
110.83
115.9

luckily its a tetragonal system, i tried to determine, the lattice parameter, and i got a=b=
2.295, and c =3.7469, but i doubt that's correct because when i tried to simulate it, there are extra peaks. so guys please help me what to do thanks.
 
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