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I create a plot (pgfplots) with the following command. I would like to filter some of the rows in myFile.csv according to some conditions. E.g value in col myZcol > 3 or myZcol=3. Is it possible?

\documentclass[tikz]{standalone}

\usepackage{pgfplots}
\pgfplotsset{ytick style={draw=none}, xtick style={draw=none}}
\usetikzlibrary{patterns}


\begin{document}
\begin{tikzpicture}
\footnotesize
    \begin{axis}
    \addplot[color=purple,mark=o]  table [x=myXCol,y=myYCol,col sep=comma, dashed, ] {myFile.csv}; %    
\legend{ser1}
\end{axis}
\end{tikzpicture}

\end{document}

Assuming myFile.csv is -

myXCol,myYCol,myZCol
1,2,3
4,5,6
7,8,9

I would like the plot to grab only the records where myZCol<7, that is only the first 2 records.

Thank you in advance

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