This visualization displays monthly global temperature anomaly data from five climate datasets—GISS, HAD, NOAA, RSS, and UAH—as multiple overlaid line series across time. The main chart shows the full time range, while a smaller focus chart beneath it displays the same data with a brushed window. Users can drag or resize the brush on the bottom chart to zoom the top chart into a specific time period, which updates the visible range of the line plot accordingly. The technique demonstrates linked brushing between two views of the same dataset, with the top chart redrawn to match the selected extent.