diff --git a/examples/hello_world_interactive.py b/examples/hello_world_interactive.py
index edc5662..f93e799 100755
--- a/examples/hello_world_interactive.py
+++ b/examples/hello_world_interactive.py
@@ -1,33 +1,31 @@
 #!/usr/bin/env python3
 import altair as alt
-
+import pandas as pd
 from KorAPClient import KorAPClient, KorAPConnection
 
 QUERY = "Hello World"
 YEARS = range(2010, 2019)
 COUNTRIES = ["DE", "CH"]
 
+df = pd.DataFrame(YEARS, columns=["Year"], dtype=str).merge(pd.DataFrame(COUNTRIES, columns=["Country"]), how="cross")
+df["vc"] = "textType=/Zeit.*/ & pubPlaceKey = " + df.Country + " & pubDate in " + df.Year
+
 kcon = KorAPConnection(verbose=True)
 
-vcs = [f"textType=/Zeit.*/ & pubPlaceKey={c} & pubDate in {y}" for c in COUNTRIES for y in YEARS]
-df = KorAPClient.ipm(kcon.frequencyQuery(QUERY, vcs))
-print(df)
-
-df['Year'] = [y for c in COUNTRIES for y in YEARS]
-df['Country'] = [c for c in COUNTRIES for y in YEARS]
+df = KorAPClient.ipm(kcon.frequencyQuery(QUERY, df.vc)).merge(df)
 df['tooltip'] = "ctrl+click to open concordances in new tab"
 
 band = alt.Chart(df).mark_errorband().encode(
-    y=alt.Y("conf.low", title=""),
+    y=alt.Y("conf.low", title="ipm"),
     y2="conf.high",
-    x="Year",
+    x="Year:T",
     color="Country",
     tooltip=["Country", "Year", alt.Tooltip("ipm", format=".2f")]
 )
 
 line = alt.Chart(df).mark_line(point=True).encode(
     y="ipm",
-    x="Year",
+    x="Year:T",
     color="Country",
     href="webUIRequestUrl",
     tooltip="tooltip"