[gmx-users] make_ndx problem

[minnale]

Hi all,
it may be trivial question 
My protien contain nearly 200 residues, I want plot RMSD for 45 to 90 residues , So I made make_ndx file also, but I am doubting that what i have I done whether right ot wrong? 
I have selcted 
1 | r 45-90 1 = protein , the way I have selected is correct or I have to select 
3 | r 45-90 3 = C-alpha
Pls tell me
Thanks in advance
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