diff --git a/testinput_tier_1/obs/osw_cygnss_obs_2020121500.nc b/testinput_tier_1/obs/osw_cygnss_obs_2020121500.nc
new file mode 100644
index 00000000..1833351b
--- /dev/null
+++ b/testinput_tier_1/obs/osw_cygnss_obs_2020121500.nc
@@ -0,0 +1,3 @@
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