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add \usepackage{pstricks}
and \usepackag{pst-plot} to preamble (in that order)

I think the problem with the other entry was some spurios lank line I left in the middle of the graphic

this one shows both lines you talk about in the entry. as usual, add captions if needed

\psplot[linecolor=blue,linewidth=1pt]{-1.65}{1.65}{2 sqrt 1 add x mul}
\psplot[linecolor=red,linewidth=1pt]{-4}{4}{1 2 sqrt sub x mul}

Parting words from the person who closed the correction: 
Status: Accepted
Reference to the user who closed the correction.: 
Reference to the article this correction is about: 
Status of the article (was it accepted?): 
Status of the article (is it closed?): 
What kind of correction is this: 

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