{ "$schema": "https://vega.github.io/schema/vega-lite/v4.json", "data": {"values": [ {"r": "r1", "c": "c1", "a": "a1", "b": "b1"}, {"r": "r1", "c": "c1", "a": "a2", "b": "b2"}, {"r": "r2", "c": "c2", "a": "a1", "b": "b1"}, {"r": "r3", "c": "c2", "a": "a3", "b": "b2"} ]}, "facet": { "row": {"field": "r"}, "column": {"field": "c"} }, "spec": { "mark": "rect", "encoding": { "y": {"field": "b", "type": "nominal"}, "x": {"field": "a", "type": "nominal"} } }, "resolve": { "scale": { "x": "independent", "y": "independent" } }}