==== notes on plotting stuff ====
  * Try a table instead of a Pareto chart - https://planspace.org/20210907-try_a_table_instead_of_a_pareto_chart/
  * Trellis Plot - https://www.jmp.com/support/downloads/JMPC80_documentation/Content/JMPCUserGuide/GR_C_0033.htm
  * heatmap plotting
    * sample plot - https://drive.google.com/file/d/15ePaR0gC2IKXm2gkeGylZ4vM_MEsWyW0/view?usp=sharing
    * came across it in https://www.mail-archive.com/r-help@r-project.org/msg263994.html