diff --git a/tests/data/target/target_demo_3.csv b/tests/data/target/target_demo_3.csv
new file mode 100644
index 0000000..a4dab76
--- /dev/null
+++ b/tests/data/target/target_demo_3.csv
@@ -0,0 +1,11 @@
+wavelength [um],spectral flux density [W/(m^2*um)]
+16,1.1e-12
+16.1,1.2e-12
+16.2,1.3e-12
+16.3,1.4e-12
+16.4,1.5e-12
+16.5,1.6e-12
+16.6,1.7e-12
+16.7,1.8e-12
+16.8,1.9e-12
+16.9,2.0e-12