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diff --git a/libcrystfel/src/indexers/asdf.h b/libcrystfel/src/indexers/asdf.h
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+/*
+ * asdf.h
+ *
+ * Alexandra's Superior Direction Finder, or
+ * Algorithm Similar to DirAx, FFT-based
+ *
+ * Copyright © 2014-2020 Deutsches Elektronen-Synchrotron DESY,
+ *                       a research centre of the Helmholtz Association.
+ *
+ * Authors:
+ *   2014-2015 Alexandra Tolstikova <alexandra.tolstikova@desy.de>
+ *   2015,2017 Thomas White <taw@physics.org>
+ *
+ * This file is part of CrystFEL.
+ *
+ * CrystFEL is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * CrystFEL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with CrystFEL.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ASDF_H
+#define ASDF_H
+
+#include "index.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \file asdf.h
+ * The ASDF indexing algorithm.
+ */
+
+extern int run_asdf(struct image *image, void *ipriv);
+
+extern void *asdf_prepare(IndexingMethod *indm, UnitCell *cell);
+extern const char *asdf_probe(UnitCell *cell);
+
+extern void asdf_cleanup(void *pp);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* ASDF_H */