Also, before I forget again, the plebiscite results according to the socioeconomic estrata of the comunas (5 being poorer and 1 richer) Bear in mind that 2021 turnout seem to be switched up (richer comunas should have the higher rate of turnout)
Overall, Approve lost more relative to Boric in the middle classes while holding slightly better with lower and upper clases. Approve had the hardest loss in the third quintile with -21,2% while "only" losing -17,6% among the rich and -15,2% among the poor. All this with wildly different turnout product of compulsory voting. The terror campaign appears to have been more effective on the middle classes that felt that had more to lose (as in, actually having homes that the evil communist were going to expropriate)
Also, keep in mind that in Chile the usual voting patterns are an inverted U, with the left being stronger with the middle class, so this lineal pattern is unusual.
If I'm reading this data right, the richest people in Chile had lower turnout than average? That's fascinating. I'm not aware of any country where that's the case.