SPX
Late last night, while I was asleep, Volpinacci (my Espresso-Machine-BOT) got some detailed 30-40 yrs back data.
Volpinacci then compared 5 different timeframes (30 min to monthly) on which distinct criteria were used to display “reasonable” target/support levels. On each timeframe, only the strongest 3 to 5 targets/supports were retained, to avoid FOG (Fake Overloaded Grid) artifacts in a further cross-selection. On the simplified final table, only coinciding levels (at least 3x) were displayed: