// declare which columns are to be used for what purpose within the line chart.
// metricAccessor: this column has the metric, to be used for the y axis
// groupBy: this column has the group name in it, to be used to create the separate lines
// spreadBy: this column has the 'spread-by', to be used for the x Axis
dataStructure=Object({
metricAccessor:"value",
groupBy:"Group",
spreadBy:"Date"
})
// title for the chart. defaults to:
title=`CO₂ ppm measurements, 1958 - 2020`
colors=["black","dimgrey","grey"]
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.