Update issue with write-up on heatmap image generation

* Work through the migrated code, and the old GN1 code and write-up a
  flow of the data, to assist in figuring out the differences in the
  data.

  The write-up helped realise that the code migrated so far only helps
  with the "distance" lines, and there is still need to figure out,
  and compute or lay out the data needed for the actual heatmap
  generation.

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