The top panel shows the unemployment rate for workers in the top quartile of exposure (red line) and the 30% of workers with zero exposure. The bottom panel measures the gap between these two series in a difference-in-differences framework.
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Writer, Amiga consultant (MobyGames)，详情可参考PDF资料
https://source.android.com/devices/storage#runtime_permissions，这一点在PDF资料中也有详细论述
Protocol Reference