Before revision:  We find that with the exception of the initial time and of the final time, the optimal control input is well approximated by a constant, specific to each area, which is in contrast with the current system of reopening `in phases'.
After revision:  We find that with the exception of the initial time and of the final time, the optimal control input is well approximated by a constant, specific to each area, which contrasts with the implemented system of reopening `in phases'.