Adds stackplot for bandwith.

plot_single_transmission_EM9190.py

         transmission_df.index = transmission_df["arrival_time"]
 
         # replace 0 in RSRQ with Nan
-        transmission_df = transmission_df["bw_sum"].replace(0, np.NaN)
+        transmission_df["NR5G_RSRQ_(dB)"] = transmission_df["NR5G_RSRQ_(dB)"].replace(0, np.NaN)
+        transmission_df["RSRQ_(dB)"] = transmission_df["RSRQ_(dB)"].replace(0, np.NaN)
         # stacked plot for bandwidth
         transmission_df["lte_bw_sum"] = transmission_df["bw_sum"] - transmission_df["NR5G_dl_bw"]
         transmission_df["nr_bw_sum"] = transmission_df["NR5G_dl_bw"]