trying again

app.py

@@ -89,9 +89,9 @@ bar_chart = (
     alt.Chart(df)
     .mark_bar()
     .encode(
-        y=alt.Y("agency:N", sort="-x"),
-        x=alt.X("ytd_gross:Q", title="Total YTD Gross"),
-        tooltip=["agency:N", "ytd_gross:Q"],
+        y=alt.Y("Agency:N", sort="-x"),
+        x=alt.X("YTD Gross:Q", title="Total YTD Gross"),
+        tooltip=["Agency:N", "ytd_gross:Q"],
         color=alt.condition(select_bar, alt.value("#4C78A8"), alt.value("#CCCCCC"))
     )
     .add_params(select_bar)
@@ -103,8 +103,8 @@ box = (
     alt.Chart(df)
     .mark_boxplot(size=40)
     .encode(
-        x=alt.X("agency:N", title=""),
-        y=alt.Y("ytd_gross:Q", title="Salary Distribution"),
+        x=alt.X("Agency:N", title=""),
+        y=alt.Y("YTD Gross:Q", title="Salary Distribution"),
         color=alt.value("#4C78A8")
     )
     .transform_filter(select_bar)   # <--- THIS CONNECTS THE GRAPHS