DOC: add extent to density facet example
@@ -19,7 +19,8 @@ alt.Chart(source).transform_fold(
).transform_density(
density='value',
bandwidth=0.3,
- groupby=['Measurement_type']
+ groupby=['Measurement_type'],
+ extent= [0, 8]
).mark_area().encode(
alt.X('value:Q'),
alt.Y('density:Q'),
