facet6.vl

{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "columns": 2,
    "data": {
        "url": "https://vega.github.io/vega-lite/data/barley.json"
    },
    "description": "The Trellis display by Becker et al. helped establish small multiples as a 'powerful mechanism for understanding interactions in studies of how a response depends on explanatory variables'",
    "facet": {
        "field": "site",
        "header": {
            "title": null
        },
        "sort": {
            "field": "yield",
            "op": "median"
        },
        "type": "ordinal"
    },
    "spec": {
        "encoding": {
            "color": {
                "field": "year",
                "type": "nominal"
            },
            "x": {
                "aggregate": "median",
                "field": "yield",
                "scale": {
                    "zero": false
                },
                "type": "quantitative"
            },
            "y": {
                "field": "variety",
                "sort": {
                    "encoding": "x",
                    "order": "descending"
                },
                "type": "ordinal"
            }
        },
        "height": {
            "step": 12
        },
        "mark": "point"
    }
}