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"""
Bar Chart with Line on Dual Axis
--------------------------------
This example shows how to combine two plots and keep their axes.
For a more polished version of this chart, see :ref:`gallery_wheat_wages`.
"""
# category: bar charts
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)
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