+my_title = "Relative symbol distances (receiver)\n" . \
+ sprintf("min call setup time %.2f s\n", call_setup_time_min) . \
+ sprintf("max call setup time %.2f s\n", call_setup_time_max) . \
+ sprintf("fixed inter call distance %.2f s\n", inter_call_distance)
+
+set multiplot layout 2, 1 title my_title font "Georgia,14"