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You can use tikzmark.

You will find the option matrix of nodes in the documentation. Thanks to the nodes now available in the cells of the matrix, their center can be addressed via an anchor and the arrows drawn. The arrows can be shortened with a suitable assignment to the shorten options and the arrows.meta library off...

Yes. TikZ is often used for this. In this case a matrix is the ideal choice.

The Section 4.7 "Markers, Linestyles, (Background) Colors and Colormaps" of the documentation of the pgfplots package should contain what you need.

We don't have the data that your example reads from the csv files.

Please complete your example to a minimal working example and use the appropriate BBCode ([code] instead of [quote]), the highlighting of which makes reading your source code more pleasant.

I will only receive your error message, if I eliminate the cause of another one beforehand. It is avoided by suppressing the expansion of your custom key unit . Read section 4.4 Expansion for an explanation. You get your error message because you use the commands \glsdescripES and \glsunit when chan...

Some off topic notes:

tabularx loads array.

The tabu package is currently not maintained.

In most cases you should load the hyperref package last.

What happens, when you load texshade before mhchem?

Without a you can only guess. If the word petroleum causes the problem, you can use the commands \hyphenation , \babelhyphenation ( babel ) or \DefineHyphenationExceptions ( biblatex ) to specify the hyphenation in the preamble yourself. The hyphenated compound word multi-mode is unlikely to be the ...