Given n spectra, this function plots an n×n correlation map with printed correlation values in each cell to ease interpretation. Since small color differences can be hard to distinguish, printed values clarify the correlations. Two text colors are used to enhance readability depending on the background.
Reference
Pearson, K. (1895). Notes on regression and inheritance in the case of two parents. Proceedings of the Royal Society of London, 58, 240-242. https://doi.org/10.1098/rspl.1895.0041
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