diff --git a/simulations/external_data/output.csv b/simulations/external_data/output.csv
new file mode 100644
index 0000000..c28448f
--- /dev/null
+++ b/simulations/external_data/output.csv
@@ -0,0 +1,27 @@
+ds1,ds2,ds3,run,substep,timestep
+0,0,1,1,0,0
+1,40,5,1,1,1
+2,40,5,1,2,1
+3,40,5,1,3,1
+4,40,5,1,1,2
+5,40,5,1,2,2
+6,40,5,1,3,2
+7,40,5,1,1,3
+8,40,5,1,2,3
+9,40,5,1,3,3
+10,40,5,1,1,4
+11,40,5,1,2,4
+12,40,5,1,3,4
+0,0,1,2,0,0
+1,40,5,2,1,1
+2,40,5,2,2,1
+3,40,5,2,3,1
+4,40,5,2,1,2
+5,40,5,2,2,2
+6,40,5,2,3,2
+7,40,5,2,1,3
+8,40,5,2,2,3
+9,40,5,2,3,3
+10,40,5,2,1,4
+11,40,5,2,2,4
+12,40,5,2,3,4