How to insert excel figures to LaTeX, I tried the following method but figure resolution too bad:
Step 1. Copy and paste the graph. Copy/paste your Excel graph to Visio. Be sure that it is pasted as Microsoft Office Excel Worksheet (this should be the default, but it can be ensured using the Paste Special option instead of Paste).
Step 2. Remove blanks spaces around the graph. Go to Design tab, then find Page Setup, go to Size and choose Fit to Drawing. This removes everything but margins. To remove margins, open the Page Setup (click on the small icon in the bottom right corner of this ribbon area), go to Print Setup tab, click on Setup and set the margins (it seems that the left margin cannot be set to 0, at least not using this approach). Then click OK twice.
Step 3. Create the PDF file. Now go to File, then Save As, from the Save as type list choose PDF. Click Options, adjust the options, then click OK and finally Save. Now there should be the PDF file with the graph.
Step 4. Import this PDF file into a LaTeX document. For this, the
\includegraphics command should be used.