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./modulation-amplitude.tex:119: Double subscript.
<argument> ...ac {1}{2} \sum _{n=0}^{\infty } S_m_
                                                  n^2} \\ 
l.119 \end{align*}
                  
I treat `x_1_2' essentially like `x_1{}_2'.

./modulation-amplitude.tex:119: Double subscript.
<argument> ...ac {1}{2} \sum _{n=0}^{\infty } S_m_
                                                  n^2} \\ 
l.119 \end{align*}
                  
I treat `x_1_2' essentially like `x_1{}_2'.

./modulation-amplitude.tex:126: Double subscript.
<argument> ... \sqrt { \sum _{n=0}^{+\infty } S_p_
                                                  n^2} \\ 
l.126 \end{align*}
                  
I treat `x_1_2' essentially like `x_1{}_2'.

./modulation-amplitude.tex:126: Double subscript.
<argument> ... \sqrt { \sum _{n=0}^{+\infty } S_p_
                                                  n^2} \\ 
l.126 \end{align*}
                  
I treat `x_1_2' essentially like `x_1{}_2'.

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