--- /dev/null
+#ifndef __VIENNA_RNA_PACKAGE_ALI_PLEX_H__
+#define __VIENNA_RNA_PACKAGE_ALI_PLEX_H__
+
+#include "data_structures.h"
+/**
+*** aliLduplexfold computes the duplexes between two alignments
+**/
+duplexT** aliLduplexfold( const char *s1[],
+ const char *s2[],
+ const int threshold,
+ const int extension_cost,
+ const int alignment_length,
+ const int delta,
+ const int fast,
+ const int il_a,
+ const int il_b,
+ const int b_a,
+ const int b_b);
+/**
+*** aliLduplexfold computes the duplexes between two alignments. It also takes the average accessibility into account
+**/
+duplexT** aliLduplexfold_XS(const char* s1[],
+ const char* s2[],
+ const int **access_s1,
+ const int **access_s2,
+ const int threshold,
+ const int alignment_length,
+ const int delta,
+ const int fast,
+ const int il_a,
+ const int il_b,
+ const int b_a,
+ const int b_b);
+
+/*
+extern duplexT aliduplexfold(const char *s1[], const char *s2[], const int extension_cost);
+extern duplexT aliduplexfold_XS(const char *s1[], const char *s2[],const int **access_s1,
+const int **access_s2, const int i_pos, const int j_pos, const int threshold);
+*/
+#endif