diff --git a/plot_single_transmission_paper.py b/plot_single_transmission_paper.py
index 5d65f90..022a303 100755
--- a/plot_single_transmission_paper.py
+++ b/plot_single_transmission_paper.py
@@ -127,6 +127,9 @@ if __name__ == "__main__":
         mask = (serial_df.index >= transmission_df.index[0]) & (serial_df.index <= transmission_df.index[-1])
         serial_df = serial_df.loc[mask]
 
+        serial_df["arrival_time"] = serial_df["time"] - serial_df["time"].iloc[0]
+        serial_df.index = serial_df["arrival_time"] / 60
+
         transmission_df.index = transmission_df["arrival_time"]
 
         # filter active state