# https://altair-viz.github.io/gallery/bar_and_line_with_dual_axis.html

import altair as alt
from vega_datasets import data

source = data.wheat()

base = alt.Chart(source).encode(x="year:O")

bar = base.mark_bar().encode(y="wheat:Q")

line = base.mark_line(color="red").encode(y="wages:Q")

(bar + line).properties(width=600)
