For each of the following four diagrams, indicate the values of $\beta_0$, $\beta_1$, $\beta_2$, and $\beta_3$ for the basic difference - in - differences OLS model. $$Y_{it} = \beta_0+ \beta_1 Treated_i + \beta_2After_t + \beta_3(Treated_i X After_t)+\epsilon_{it}$$ 4 3 2 1 4 3 2 1 Y Treated Control Before Y Treated Control After Time (a) Before After Time (c) st 4 Y Treated Control 3 2 1 4 3 2 1 Before Y Treated Control After Time (b) Time Before After (d)

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