Using Blue vertical bars from the time where MACD breaks up past 0,00 and dotted blue lines where the SP peaks. Seems to be a pattern 410 days between solid blue with peaks at 300 days and a drop over 110 days.
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I didn't anticipate the drop in Sept 2022 but it's heading back up toward the line again now. 1,35-6 looks like the target for now.