diff --git a/sim_specs/c4_ecn_bbr.txt b/sim_specs/c4_ecn_bbr.txt
new file mode 100644
index 0000000..f7dc2b7
--- /dev/null
+++ b/sim_specs/c4_ecn_bbr.txt
@@ -0,0 +1,15 @@
+main_cc_algo: c4
+main_start_time: 0
+main_scenario_text: =b1:*1:397:10000000;
+nb_connections: 2
+main_start_time: 1000000
+main_target_time: 15500000
+background_cc_algo: bbr
+background_start_time: 0
+background_scenario_text: =b1:*1:397:20000000;
+data_rate_in_gbps: 0.02
+latency: 40000
+l4s_max: 15000
+queue_delay_max: 100000
+icid: ccecc4bb
+qlog_dir: cclog
\ No newline at end of file
diff --git a/sim_specs/c4_ecn_c4.txt b/sim_specs/c4_ecn_c4.txt
new file mode 100644
index 0000000..c291789
--- /dev/null
+++ b/sim_specs/c4_ecn_c4.txt
@@ -0,0 +1,15 @@
+main_cc_algo: c4
+main_start_time: 0
+main_scenario_text: =b1:*1:397:10000000;
+nb_connections: 2
+main_start_time: 1000000
+main_target_time: 15600000
+background_cc_algo: c4
+background_start_time: 0
+background_scenario_text: =b1:*1:397:20000000;
+data_rate_in_gbps: 0.02
+latency: 40000
+l4s_max: 15000
+queue_delay_max: 100000
+icid: ccecc4c4
+qlog_dir: cclog
\ No newline at end of file
diff --git a/sim_specs/c4_ecn_cubic.txt b/sim_specs/c4_ecn_cubic.txt
new file mode 100644
index 0000000..5583d3e
--- /dev/null
+++ b/sim_specs/c4_ecn_cubic.txt
@@ -0,0 +1,15 @@
+main_cc_algo: c4
+main_start_time: 0
+main_scenario_text: =b1:*1:397:10000000;
+nb_connections: 2
+main_start_time: 1000000
+main_target_time: 7000000
+background_cc_algo: cubic
+background_start_time: 0
+background_scenario_text: =b1:*1:397:20000000;
+data_rate_in_gbps: 0.02
+latency: 40000
+l4s_max: 15000
+queue_delay_max: 100000
+icid: ccecc4cb
+qlog_dir: cclog
\ No newline at end of file