{ "$schema": "https://vega.github.io/schema/vega-lite/v4.json", "data": { "values": [ {"wavelength": 250, "power": 1}, {"wavelength": 300, "power": 2}, {"wavelength": 420, "power": 4}, {"wavelength": 450, "power": 1.8}, {"wavelength": 500, "power": 1.1} ] }, "transform": [{ "filter": {"field": "wavelength", "range": [300, 450]} }], "mark": "line", "encoding": { "x": { "field": "wavelength", "type": "quantitative", "scale": {"domain": [300,450]} }, "y": { "field": "power", "type": "quantitative" } }}