Adds stackplots.

plot_single_transmission_EM9190.py

         #               colors=["lightsteelblue", "cornflowerblue"],
         #               labels=["4G bandwidth", "5G bandwidth"]
         #               )
-        transmission_df.plot().area(y=["lte_bw_sum", "nr_bw_sum"], ax=ax01)
+        transmission_df.plot.area(y=["lte_bw_sum", "nr_bw_sum"], ax=ax01)
 
         ax02.plot(transmission_df["RSRQ_(dB)"].dropna(), color="purple", linestyle="dotted", label="LTE RSRQ")