The 1990 Analog

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I happened to see this comment and found it intriguing:

comment

So out comes SlopeCharts and its 2 by 1 mode. Indeed, this is an interesting analog. Former chart (young Tim) on the bottom; recent chart (present-day Tim) on top.

analog

Here, by the way, is what happened in 1990:

drop

Thank you, Ashok!