Cols (1) and (2):
\[
\text{Treatment}_{c} = \pi_{0} + \pi_{1}\text{RecenteredIV}_{c}
+ \pi_{2}\text{HighAg}_{c} + X_{c}\pi_{3} + \varepsilon_{c}
\]
Cols (3) and (4):
\[
\text{Treatment}_{c}\times\text{HighAg}_{c}
= \pi_{0} + \pi_{1}(\text{RecenteredIV}_{c}\times\text{HighAg}_{c})
+ \pi_{2}\text{RecenteredIV}_{c} + \pi_{3}\text{HighAg}_{c}
+ X_{c}\pi_{4} + \varepsilon_{c}
\]
