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Hey mate,
I just did a small edit to the code to allow for the option of saving files under a specified filename.
If filename is left blank, then there will be no behavior change, code should function exactly as before.
If you do specify a filename (i.e. "heatmap.png") it will trigger a clause that will save the plot as a file.
Intended purpose is to make using the code to update analytics pages and dashboards easier.