diff --git a/garage-latency-simple.R b/garage-latency-simple.R
index 4fd356c..f6fb5c1 100755
--- a/garage-latency-simple.R
+++ b/garage-latency-simple.R
@@ -31,12 +31,17 @@ if (!file.exists("~/go/bin/s3lat")) {
   system("go install git.deuxfleurs.fr/quentin/s3lat@latest")
 }
 
+Sys.getenv("MKNET_DC") -> mknet_dc
+if (mknet_dc == "") {
+  "./mknet/single-dc.yml" -> mknet_dc
+}
+
 if (!file.exists("50ms.garage.csv")) {
   system("rm -fr /tmp/garage-testnet")
   if (file.exists(".current_state.yml")) {
     system("mknet destroy")
   }
-  system("mknet create ./mknet/single-dc.yml")
+  system(paste("mknet create", mknet_dc))
   system("mknet run-all ./mknet/deploy_garage.sh")
   system("mknet run dc1:dc1s1 ./mknet/bench_garage.sh")
   system("mknet destroy")
@@ -49,7 +54,7 @@ if (!file.exists("50ms.minio.csv")) {
   if (file.exists(".current_state.yml")) {
     system("mknet destroy")
   }
-  system("mknet create ./mknet/single-dc.yml")
+  system(paste("mknet create", mknet_dc))
   system("mknet run-all ./mknet/deploy_minio.py")
   system("mknet run dc1:dc1s1 ./mknet/bench_minio.sh")
   system("mknet destroy")
@@ -63,6 +68,13 @@ bind_rows(a,b) %>% group_by(daemon,endpoint) %>% summarise(
   time_min = min(nanoseconds) / 1000 / 1000
 ) -> c
 
+st <- "100 measurements, 5 nodes, 100ms RTT + 20ms jitter between nodes\nno contention: latency is due to intra-cluster communications\ncolored bar = mean latency, error bar = min and max latency"
+
+if (mknet_dc == "./mknet/multi-dc.yml") {
+  st <- "100 measurements, 6 nodes in 3 DC (2 nodes/DC), 100ms RTT + 20ms jitter between DC\nno contention: latency is due to intra-cluster communications\ncolored bar = mean latency, error bar = min and max latency"
+}
+
+
 ggplot(c, aes(x=endpoint,y=time_mean,fill=daemon,ymin=time_min,ymax=time_max)) +
       geom_bar(stat="identity", position=position_dodge(),color="black") +
       geom_errorbar(position=position_dodge(.9),width=.2) + 
@@ -74,7 +86,7 @@ ggplot(c, aes(x=endpoint,y=time_mean,fill=daemon,ymin=time_min,ymax=time_max)) +
         fill="Daemon",
         caption="Get the code to reproduce this graph at https://git.deuxfleurs.fr/quentin/benchmarks",
         title="S3 endpoint latency in a simulated geo-distributed cluster",
-        subtitle="100 measurements, 5 nodes, 100ms RTT + 20ms jitter between nodes\nno contention: latency is due to intra-cluster communications\ncolored bar = mean latency, error bar = min and max") + 
+        subtitle=st) + 
       theme_classic() + 
       theme(legend.position = c(.8, .3))
 
diff --git a/mknet/deploy_minio.py b/mknet/deploy_minio.py
index 0d6b3dc..431b983 100755
--- a/mknet/deploy_minio.py
+++ b/mknet/deploy_minio.py
@@ -19,7 +19,7 @@ def leader():
     sock.bind(UNIX_SOCK)
     sock.listen()
 
-    n_serv = int(os.environ['SIZE'])
+    n_serv = int(os.environ['SERVER_COUNT'])
     fl = [ co for co, addr in [ sock.accept() for i in range(n_serv - 1) ]]
 
     identities = [ json.loads(co.makefile().readline()) for co in fl ] + [ { "ip": os.environ['IP'], "path": make_data() } ]