I have some distances in Excel in the following format

I need to create a heatmap in Excel or in any other tool, so that I would be able to differentiate the values from each of the data.
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You could also apply conditional formatting to your table. Just select one of the preset “Color Scales” rules. This won’t create your heat map as a graphic, but rather it will be built into the cells in your worksheet. See my answer to a previous question on SuperUser. You can avoid all the data transformation steps I describe there because your data is already in the right form to do this.