Fig. 3.

County-Level Exposure to New York County (Manhattan). Notes: Each panel of this figure depicts, for each of 2,018 counties, the share of devices pinging in that county that had pinged in New York, New York during the previous 14 days. The four panels depicts this for four Saturdays in 2020. Using the notation of Section 3, the four panels depict $LE{X}_{36061,g^{\prime },d}$ for $d$ equal to February 29, May 30, August 29, and November 28, of 2020, where 36061 is the FIPS code for New York County.