diff --git a/.gitignore b/.gitignore
index c068a06..89d3880 100644
--- a/.gitignore
+++ b/.gitignore
@@ -100,7 +100,6 @@ ENV/
 # mypy
 .mypy_cache/
 *~
-*.wdf
 /.piped
 /.downloaded
 .DS_Store
@@ -110,6 +109,5 @@ ENV/
 /*.csv
 /*.svg
 /bin/renishaw-export.py
-*.txt
 *.csv
 /examples/*.svg
diff --git a/examples/spectra_files/expert/Image4_autofocus.wdf b/examples/spectra_files/expert/Image4_autofocus.wdf
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index 0000000..eff84ba
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diff --git a/examples/spectra_files/expert/Image4_autofocus_spc.spc b/examples/spectra_files/expert/Image4_autofocus_spc.spc
new file mode 100644
index 0000000..d7274c9
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diff --git a/examples/spectra_files/expert/Spectrum_532nm_wdf.wdf b/examples/spectra_files/expert/Spectrum_532nm_wdf.wdf
new file mode 100644
index 0000000..c3a1176
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diff --git a/examples/spectra_files/expert/Spectrum_532nm_wdf_spc.spc b/examples/spectra_files/expert/Spectrum_532nm_wdf_spc.spc
new file mode 100644
index 0000000..c16c1ea
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