Plot arrows when plotting a single trajectory

Trajectories/Analysis/plot_traj.py

@@ -180,7 +180,7 @@ if __name__ == "__main__":
                     args.annotate,
                     color="red",
                     color_initial="green",
-                    arrows=False,
+                    arrows=True,
                 )
                 break
         else:
@@ -196,7 +196,7 @@ if __name__ == "__main__":
             args.annotate,
             color="red",
             color_initial="green",
-            arrows=False,
+            arrows=True,
         )
     else:
         if args.alt: