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I want to know if there is a way to use box at multiple location inside a figure. I figured out how to hightlight one location by using node. But I need to add few more boxes to two subfloats so that I can compare them. Below is the figure. I added one red box and I want add 10 more of them to both top and bottom figure. Thank you! enter image description here

Yihan Chen
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    Welcome! If you know how to highlight one location, can't you just apply this knowledge ten times to highlight ten? –  Sep 25 '19 at 23:00
  • I take it you want to use axis cs: for the horizontal coordinates and rel axis cs: for the top and bottom. You can also name the axis and use (name.north) and (name.south). Then just define the perpendicular intersections (a |- b) or (a -| b) where a and b are two coordinates (no parentheses). – John Kormylo Sep 25 '19 at 23:11
  • I think \node can only use once for each figure since each node imports a image. At least this is the code I got from google. I don’t know how to use multiple node with only one image – Yihan Chen Sep 26 '19 at 01:47
  • You can use https://tex.stackexchange.com/a/9562/194703 to draw on any plot. Please show the code that you are using. –  Sep 26 '19 at 04:11
  • This is the technique I'm using right now. However, whenever I add another draw there will be a line connect the new box with previous ones. Here's my code: \begin{figure}[htp]
    \begin{tikzpicture}
    \node[anchor=south west,inner sep=0] at (-4.7,-2.2)
    {\includegraphics[width=0.9\textwidth]{"ImpvsOriS2".eps}}; \draw[red,thick] rectangle (0.5,2.5); \draw[red,thick] rectangle (2.5,0) -- (3,0) -- (3,2.5) -- (2.5,2.5) -- (2.5,0); \end{tikzpicture} \caption{Comparison of original and modified QRSDS Method for (a) S1 and (b) S2} \label{fig:ImpCompDettest} \end{figure    }     – Yihan Chen Sep 26 '19 at 05:00

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