Plot.plot({
x: {
tickFormat: ""
},
marks: [
Plot.line(wtorny, {x: "Year", y: "medianPrice", k: k, reduce: "mean", stroke: "city"}),
Plot.dot(wtorny, {x: "Year", y: "medianPrice", fill: "city"})
],
inset: 8,
grid: true,
color: {
legend: true,
},
marginLeft: 50,
marginBottom: 50
})